The aim of this function is to receive the key fob signal and decode it. There are 4 different data included in the radio frequency frame sent by the RKE to the IPM module:
-
Central door lock
-
Central door unlock
-
Panic function
-
Tailgate unlock (for China)
Each vehicle can have at most 2 associated key. The key is physically separated from the key itself (separate device).
Description
The RF signal from the key is received by a special IPM daughter board. This signal (RKE signal) is transmitted to the micro controller where the RKE function is in charge of decoding it.
Lock/Unlock with key
When the key Lock (respectively Unlock) button is pressed, a Lock command (respectively Unlock) is issued for all doors by IPM.
In the following description “all doors” means driver door, assist door, left rear door, right rear door and tailgate.
Central lock/unlock with key is independent of door lock status.
In all cases, when IPM issues lock/unlock command, it does not check monitoring switches to make sure command was successful.
Remote Keyless Entry Panic
When the key fob panic button is pressed, the siren and also the horn depending on the country are switched on and the hazard lamps are activated.
Function
IPM
Description
RKE function does not work when any of the car keys is inserted in the ignition key cylinder.
Lock / Unlock
Description
Lock /Unlock with key
Lock /unlock with key is independent from door lock status, Door Lock control is sent with lock value even if door lock status is already locked
Lock /Unlock with key fob
If there is no door, tailgate or key insert before and within 30seconds after RKE unlock (except RKE Tailgate Unlock), all doors lock themselves using standard lock procedure (All lock sent from IPM for 500ms then no action). Answer back is like that for a Lock with key fob.
Lock /Unlock with key fob
If IPM receives a new RKE unlock while 30 s lock timer is already started, 30’s timer is restarted.
Lock
Description
Lock with key fob:
When receiving key fob signal lock, IPM immediately issues Door lock control CAN signal with value all lock for 0.5 s for locking all doors.
Unlock
Description
Unlock with key fob:
When receiving key fob signal unlock, IPM immediately issues door lock control CAN signal with value all unlock for 0.5 s for locking all doors.
Multiple Lock / Unlock within 500 ms
Description
Multiple lock/unlock within 500 ms
2 consecutive RKE LOCK signals:door lock control CAN signal is sent with value all lock for 0.5 s upon reception of the first signal. The 2nd signal has no action on door lock control.
Multiple lock/unlock within 500 ms
RKE lock followed by UNLOCK signal: Door Lock control CAN signal is sent with value all lock upon reception of the first signal. When 2nd signal is received, door lock control is set to no actionfor 100 ms and then all unlock is sent for 500 ms.
Multiple lock/unlock within 500 ms
2 consecutive RKE unlock signals: Door lock control CAN signal is sent with value all unlock for 0.5 s upon reception of the first signal. The 2nd signal has no action on Door Lock control.
Multiple lock/unlock within 500 ms
RKE unlock followed by LOCK signal:door lock control CAN signal is sent with value all unlock upon reception of the first signal. When 2nd signal is received, door lock control is set to no action for 100 ms and then all lockis sent for 500 ms.
Description
RKE Lock/Unlock and RKE Tailgate Unlock within 500 ms
Within 500 ms of a RKE Lock/Unlock, a RKE Tailgate unlock is not taken into account, there is no action.
Panic
Description
RKE Panic Function for Korea and General
When the RKE panic signal is received, the following actions occur:
Turn indicators are flashed at a 1Hz frequency (0.5s On/0.5s Off) for 27 s using Turn Indicator control CAN signal.
The Siren is activated at a 1Hz frequency (0.5s On/0.5s Off) for 27 s usingsiren drive output(command sent by the IPM to FAM by CAN signal Sirencontrol, and relay drive located on the FAM).
RKE Panic Function Cancel
Panic is cancelled (turn indicators and siren management) if one of the buttons of the keyfob (Lock, unlock, tailgate unlock, Panic) is pushed or ignition key is inserted or if the system enters in ALARM mode while panic is activated.
Tailgate Unlock
Description
RKE Tailgate unlock
When receiving key fob signal tailgate unlock, IPM immediately issues Door Lock control CAN signal with value tailgate unlock for 0.5 s for unlocking the tailgate
Multiple RKE Tailgate Unlock within 500 ms
Within 500 ms of a RKE tailgate unlock, a new RKE tailgate unlock is not taken into account, there is no action.
RKE Tailgate Unlock and RKE Lock within 500 ms
When a RKE Tailgate unlock occurs, IPM sends the CAN signal door lock control with the value tailgate unlock. Within 500 ms of this occurrence, if a RKE Lock occurs, IPM sends the CAN signal door lock control with the value no action for 100 ms and then with the value all lock for 500 ms.
RKE Tailgate Unlock and RKE Unlock within 500 ms
When a RKE Tailgate Unlock occurs, IPM sends the CAN signal Door Lock control with the value tailgate unlock. Within 500 ms of this occurrence, if a RKE Unlock occurs, IPM sends the CAN signal Door Lock control with the value no action for 100 ms and then with the value all unlock for 500 ms.
Description
The RKE function is always ready to receive an RKE signal even when the IPM is in sleep mode.
Description
Sleep Mode:
IPM does not enter SLEEP MODE* while the unlock 30s timer is running.
Burglar Alarm system
Alarm
Description
The Burglar Alarm function purpose is to prevent intrusion in the vehicle when it has been locked. Burglar Alarm system is armed after all doors have been closed and locked (by key fob or driver/assist door key cylinder) and key is not inserted in ignition key cylinder.
Once it is armed the system considers an attack as any entrance (doors, hood and tailgate) opened.
For the rest of this document the following terms are used:
Mech. Key: Driver door key cylinder lock/unlock, Assist door key cylinder key lock/unlock
Entrance: All doors and hood
Functional Diagram
Function
IPM
Description
Burglar Alarm State machine
* Waiting for RAM synchronization (tailgate closed handle disabled → closed handle enabled transition) during 3 sec, see corresponding requirement for more details.
Burglar Alarm State machine for China
* Waiting for RAM synchronization (tailgate closed handle disabled -> closed handle enabled transition) during 3 sec, see corresponding requirement for more details.
SMK Lock/Unlock includes Active and Passive Lock/Unlock.
Tailgate unlock includes Key fob tailgate unlock, SMK Active tailgate unlock and SMK Passive tailgate unlock.
Description
Condition A for RKE equipped vehicle
-
All doors are closed: Driver door open switch status, assist door open switch status, rear door open switch status and tailgate open switch status are set to closed
-
Door lock status for all doors is lock: Driver door open switch status, assist door open switch status, rear door open switch status are set to locked, tailgate open switch status to closed handle disabled
-
Hood is closed: hood switch input to off
-
Key is not inserted: Ignition key reminder switch input is not inserted
-
Ignition switch status is OFF
Condition A for SMK equipped vehicle
-
All doors are closed: Driver door open switch status, assist door open switch status, rear door open switch status, tailgate open switch status are set to CLOSED
-
Door lock status for all doors are lock: Driver door lock monitor switch status, assist door lock monitor switch status, rear door lock monitor switch status are set to locked, tailgate open switch status to closed handle disabled
-
Hood is closed: Hood switch input to off
-
Ignition switch status is OFF
Attack description
The system is under attack when any doors, hood or tailgate is open: Driver door open switch status, assist door open switch status, rear door open switch status, tailgate open switch status is issued with open value or hood switch input to on
Description
Expiration of the timer Tailgate unlock, answer back
When IPM receives the CAN signal tailgate open switch status with the value close handle disabled following a tailgate unlock and the system goes from PREARM to ARM_WAIT state, only in this case the answer back is like that of RKE lock.
Description
3 sec timer when Tailgate unlock in ALARM, AFTER_ALARM or REARM states
A 3 sec timer is started when the Tailgate unlock is detected under ALARM, AFTER_ALARM or REARM condition. During this timeout, if the tailgate state changes from closed handle disable to closed handle enable, the system goes immediately to PREARM state. If 3 sec timer is elapsed and the tailgate is still in closed handle disable state, the system goes to PREARM state. The 3 sec timeout is aborted when leaving the current alarm state due to valid leave condition (any door opened, key unlock…)
Description
DISARM mode with Mech. Key unlock
If Mech. Key unlock signal is received in any mode, the system immediately goes into DISARM state.
DISARM mode with PIC Authentication
If PIC authentication signal is received in any mode with value FOB authorized, the system immediately goes into DISARM state.
DISARM mode with Transport Authentication
If transport authentication signal is received in any mode with value transport authorized, the system immediately goes into DISARM state.
DISARM mode with Ignition key from ARM for RKE equipment only
If ignition key reminder switch input is inserted & IGN 1 & IGN 2 are turned ON in ARM then the system immediately goes into DISARM state.
DISARM mode with Ignition key from ARM for SMK equipment only
If IGN 1 & IGN 2 are turned ON in ARM then the system immediately goes into DISARM state.
DISARM mode with Ignition key from 30s DELAY for RKE equipment
If ignition key reminder switch input is inserted or ACC or IGN1 or IGN2 are turned ON in 30s DELAY then the system immediately goes into DISARM state.
DISARM mode with Ignition key from 30s DELAY for SMK equipment
If ACC or IGN1 or IGN 2 is turned ON in 30s DELAY then the system immediately goes into DISARM state.
Description
PREARM mode entry
The system enters in PREARM mode in these cases :
-
Lock by the RKE
-
Lock by SMK Active or Passive
-
Lock by Mech. Key
-
Auto-lock following a Lock (RKE or SMK) with 30s no action
PREARM mode exit
In the PREARM mode, if the opened doors are closed, i.e., the vehicle condition is compliant with the Condition A, then the system enters into ARM_WAIT mode
Description
ARM WAIT mode timer
30sec timer starts as soon as entering to ARM WAIT mode
ARM WAIT mode delay time
The delay time between the locking of door lock actuator and the entering time into ARM_WAIT mode is 0.6 second.
ARM WAIT mode with Key lock
The system enters ARM_WAIT mode after the locking with key fob or Mech. Key.
ARM WAIT mode with SMK lock
The system enters ARM_WAIT mode after the active or passive locking with SMK.
ARM WAIT mode exit for RKE equipped vehicle
If one of the following conditions happens during 30sec timer is ongoing, DISARM mode is immediately entered:
-
Any entrance open (Driver, Assist, Rear Left/Right doors, Tailgate and Hood)
-
Key In
-
Attack
-
Mech. Key unlock
-
Fob authorized or TP authorized
Description
30 sec Delay mode entry for RKE equipment
If key fob unlock signal is received in any mode when all doors (including driver, assist, rear doors, tailgate and hood) are closed, the system goes into 30s delay mode. In this state, if one of the following conditions happens within 30 second after receiving key fob unlock signal then the system goes to DISARM state.
One of any entrance is open
Ignition key reminder switch input is inserted
If no entrance is opened within 30 second after receiving the signal, then the system automatically issues the lock pulse and goes to the ARM_WAIT state. Answer back is needed for this case either.
30 sec Delay mode entry for SMK equipment
If key fob unlock signal or SMK active/passive unlock (when equipped) is received in any mode when all doors (including driver, assist, rear doors, tailgate, flip up and hood) are closed, the system goes into 30s delay mode. In this state, if one of the following conditions happens within 30 second after receiving key fob unlock signal then the system goes to DISARM state.
One of any entrance is open
Ignition switch state ACC or IGN1 or IGN2 at ON
If no entrance is opened within 30 second after receiving the signal, then the system automatically issues the lock pulse and goes to the ARM_WAIT state. Answer back is needed for this case either.
Description
30 sec Delay mode exit to ARM
If none of the above conditions happens within 30 second after receiving key fob signal, then the system automatically issues the lock pulse and goes to the ARM_WAIT state. Answer back is needed for this case either.
30 sec Delay mode reset
If another unlock key fob signal during the 30s delay, the timer of 30s is reset.
Description
ARM mode entry
If 30second timer is elapsed without any from the ARM_WAIT mode, then system goes to ARM mode.
Key fob, SMK Active/Passive Tailgate Unlock in ARM mode
If TG unlock is received in ARM mode, Tailgate handle is enabled during 30s, if tailgate or flip up is open during this timer then the system goes to PREARM mode
T1 : 27 sec (-0, + 3 sec)
T2 : 10 sec (-0, + 3 sec)
T3 : 0.5 ± 0.1 sec
Description
ALARM mode
If one or more of entrances are opened in the ARM or REARM state, then burglar drive output is turned ON in order to inhibit the start condition and Turn Indicator control signal is sent with hazard value and Siren control is sent with ON during 27 sec only once.
Description
ALARM mode synchronization
Siren control and Turn Indicator control are synchronized to get the same output period.
Door close during ALARM
Even though all the doors are closed during alarm, alarm continues to operate for the remaining time.
New attack, AFTER_ALARM
When there is a new attack (with one of the entrance still open) in the vehicle after completing the alarm output, alarm is not started again.
New attack during ALARM answer back
If there is a new attack during the alarm operating, this new attack is not taken into account Siren control and Turn Indicator control outputs continue to operate by the remaining time. Burglar alarm relay drive output is also maintained on as long as the system is in ALARM condition.
Key fob Unlock during ALARM
In case of receiving Key Fob UNLOCK signal during ALARM, if all doors (including driver, assist, rear doors, tailgate and hood) are closed the system goes directly into the 30sec delay state with following behavior.
-
Unlock output is turned on for 0.5 second
-
Hazard & Siren output for alarm function are turned OFF
-
Burglar alarm relay drive output is turned OFF
Key Fob Lock during Alarm
In case of receiving Key Fob lock during ALARM (with one of the doors opened), the ALARM stops functioning and the system goes to PREARM state
-
LOCK output is turned ON for 0.5 second
-
Hazard & Siren output for alarm function are stopped immediately
-
Burglar alarm relay drive output is turned OFF
-
The system stay at the PREARM state, and if the vehicle condition meets the ARM entering condition, then the system goes to ARM_WAIT state from the PREARM state
Key fob, SMK Active/Passive Tailgate Unlock during Alarm
If tailgate unlock is received during ALARM, the system goes to PREARM mode :
during 3 sec timeout, immediately if tailgate open switch status closed handle disabled → closed handle enabled transition detected after 3 sec timeout if the tailgate open switch status is still closed handle disabled
Description
AFTER_ALARM mode, time elapsed
If ALARM cycle is elapsed, the system goes into AFTER_ALARM state.
AFTER_ALARM mode answer back
During AFTER_ALARM state,
Burglar drive output maintains ON
Siren and hazard lamp output are stopped.
AFTER_ALARM mode, door opened again
If another door is newly opened during AFTER_ALARM state and other door are still open, then burglar alarm relay drive output maintains ON but no Siren output & hazard output in this case.
AFTER_ALARM mode exit with Key fob
If tailgate unlock is received during AFTER_ALARM, the system goes to PREARM mode:
-
During 3 sec timeout, immediately if tailgate open switch status closed handle disabled → closed handle enabled transition detected
-
After 3 sec timeout, if the tailgate open switch status is still closed handle disabled
AFTER_ALARM mode exit with Key fob, SMK Active/Passive Tailgate Unlock
If tailgate UNLOCK is received during AFTER_ALARM, the system goes to PREARM mode:
-
During 3 sec timeout, immediately if tailgate open switch status closed handle disbled → closed handle enabled transition detected
-
After 3 sec timeout, if the tailgate open switch status is still closed handle disabled
Description
REARM mode entry
If all entrances are closed during AFTER_ALARM state, the system goes into REARM state.
REARM mode to ALARM
If there is the new attack during REARM mode, the system goes to ALARM mode.
REARM mode exit with Key fob, SMK active/passive tailgate unlock
If Tailgate UNLOCK is received during REARM, the system goes to PREARM mode:
during 3 sec timeout, immediately if tailgate open switch status closed handle disabled → closed handle enabled transition detected after 3 sec timeout, if the tailgate open switch status is still closed handle disabled
Description
Battery removal in ARM
If disconnecting and then connecting again battery (Battery feed to bcm to off then on again) at ARM condition, ARM condition continues.
Battery removal after ALARM
If disconnecting and then connecting again battery (Battery feed to bcm to off then on again) after completion of ALARM, alarm function is activated again.
Battery removal in ALARM
If disconnecting and then connecting again battery (Battery feed to bcm to off then on again) during alarm, alarm is reset and activated again.
Battery removal in ARM_WAIT
If disconnecting and then connecting again battery (Battery feed to bcm to off then on again) during ARM_WAIT, they system goes to DISARM mode.
Description
ALARM and PANIC
ALARM has higher priority than PANIC function.
RKE PANIC and AFTER_ALARM mode
If RKE PANIC signal is received, AFTER_ALARM mode is maintained and PANIC function is activated.
SMK PANIC and AFTER_ALARM mode
If SMK PANIC signal is received, AFTER_ALARM mode is maintained and PANIC function is activated.
Description
Authentication not authorized with SMK
If IPM receives the CAN signal PIC authentication with the value PIC not authorized or TP authentication with the value TP not authorized then IPM does nothing.
Description
Error Cases
In case of CAN failure, value invalid or undefined of lock monitoring sw, Open sw CAN signals, doors (except tailgate) are considered open and unlocked.
In DISARM alarm state, in case of CAN failure, value INVALID or undefined of CAN signal tailgate open switch status, the default value used is closed handle disabled. In other alarm state, the default value used is open.
This means that in case of problem with RAM/ADM/DDM, the vehicle will not enter in ARM state. If the vehicle is already in ARM state when the problem happens, the system will go in ALARM state.
Invalid values from SMK passive
In case of CAN failure, value invalid or undefined of both CAN signals Detected FOB1 and Detected FOB2 or CAN signal driver door Passive switch status SwSts, AD_PassiveSwSts, TG_PassiveSwSts, PassiveUnlockCtrl, PassiveLockCtrl,
IPM considers that the corresponding function is inactive (DetectedFOB1, DetectedFOB2 =
PassiveUnlockCtrl, PassiveLockCtrl = NO_ACTION). Burglar alarm keeps its current state.
INVALID values from SMK active
In case of CAN failure, value INVALID or undefined of both CAN signals DetectedFOB1 and DetectedFOB2 or CAN signal RKE_LockCtrl, RKE_UnlockCtrl, RKE_TailGateCtrl, SMK_PanicCtrlIPM considers that the corresponding function is inactive (values OFF). Burglar alarm keeps its current state.
FAM
Description
Turning on Siren
When receiving CAN message Siren control with ON value, siren drive output is set to ON
Turning off Siren
When receiving CAN message Siren control with OFF value, siren drive output is set to OFF
RKE Learning System
Description
This is the procedure for the RKE key learning and synchronization for HM Program.
The IPM and the RF keys are delivered by separated logistic flow and are not linked when they are delivered to the assembly plant.
The learning of the keys must be done in two steps:
-
First by learning Fix Code of the Key.
-
Second by synchronizing Rolling Code between IPM and key, by the first frame received outside the learning procedure.
The RF transmitter (inside the key) is programmed in supplier line on the base of a 24 bits serialized number, which determines the Identifier and Start code value, insuring that all codes are different.
The learning procedure uses the RF frame emission to transmit the RF code data from the key, and a diagnosis tool to control the procedure (Hi-Scan - using the K line).
This learning can be done on Customer dealers or in the garages.
Functional Diagram
IPM
Description
Key Learning procedure, key reminder switch status
Key learning procedure is possible only if ignition key is not inserted.
Key Learning procedure condition
The RF transmitter (inside the key) is programmed in supplier line on the base of a 24 bits serialized number, which determines the Identifier and Start code value, insuring that all codes are different.
The learning procedure uses the RF frame emission to transmit the RF code data from the key, and a diagnosis tool to control the procedure
Key learning procedure, disabled commands
During the learning procedure, all commands (locking, unlocking, etc) by RKE are disabled
Description
Key Learning procedure description
Step
Operator action
RF
transmitter
reaction
IPM reaction
1
Connection of the diagnosis tool to the K line of the vehicle
2
Sending of diagnosis frame « RF learning start »
IPM switches in learning mode and disables all the keys(feedback information on the tool’s screen)
3
Sending of diagnosis frame « learning of one key »
IPM is now waiting for a RF frame to learn the key data (feedback information on the tool’s screen)
4
Short push on the LOCK or UNLOCK button of the key to be learnt
Transmission of a RF frame
First Key learning (within the same learning cycle)
a - Write to Eeprom, ID and Rolling Code (any previous value is overwritten)
b - Erase (all related bytes set to 0xFF) ID/Rolling code of all other keys
c - Trigger the buzzer sound for one time after successful completion these steps.
(Notification of diagnostic layer is done for each processed key)
5
Learning of the 2nd, 3rd and 4th keys (if any)
Transmission of a RF frame
Second Key learning (within the same learning cycle)
a:
-
If new Key is different from Learnt Key #1: Write to Eeprom, ID and Rolling Code (any previous value is overwritten)
-
If new Key is identical to Learnt Key #1: Exit learning session.
b: Trigger the buzzer sound for one time after successful completion these steps
c: Exit the learning session (at application software layer) when the maximum number of key to be learnt is
Description
Key Learning procedure timer
RF Key code saving (Key teaching) is allowed while a “10s Learning Procedure Timer” is running.
This timer is:
Started at reception of the “learning routine start” CAN command
Restarted at each learnt key (i.e. successfully stored in eeprom)
Stopped at any exit reason of the learning process: Maximum number of keys learnt, exit on error case, reception of “learning routine stop”
Example : Learning Process Results for Four Key fobs
NO.
Current key fob
Learning key fob
Changed key fob
1
None(Virgin)
A, B, C, D
A, B, C, D
2
A, B, C, D
E
E ( Delete ‘A’, ‘B’, ‘C’, ‘D’)
3
A, B, C, D
C, D, E, F
C, D, E, F
4
A, B, C, D
FAIL
A, B, C, D
Description
Key learning procedure cancel
Before first key learning or during first key learning, it is always possible to cancel the learning procedure.
Key learning procedure cancel methods
Cancellation can be done using 4 methods:
Sending a specific diagnosis frame « Cancel RF learning »
Sending standard diagnosis frame « End of diagnosis session »
Waiting a time-out of 15 minutes without sending diagnosis frame « Learning of one key »
After the first key learning, cancel in learning procedure will not restore the previous learning configuration, IPM keeps first learnt key data and status.
Key learning procedure end, already learnt key
The learning procedure finishes if there is an attempt of key learning with a key that has already been learnt in the current learning procedure.
Key learning procedure end, max key already learnt
Finish the learning procedure after the learning of a number of keys equal to the maximum number (maximum number of RKE is 4)
RKE Synchronization
Description
Once the learning procedure is finished, the operator has to push RF key button of each learnt key to check keys are operational; a door locking/unlocking action is done as feedback.
This first reception and processing of a rolling code data after the learning procedure is the first synchronization (between key and IPM, from a rolling code point of view).
note
A key is said “active” (learnt), when it has been learnt by way of a learning procedure.
A key is said “synchronized” (operational), when it has been synchronized after the learning procedure
(i.e. validated by a locking/unlocking action with Scan tool connected)
IPM
Description
Key synchronization procedure
There is no time limit between the learning procedure and the synchronization procedure.
Key synchronization procedure description
Step
Operator action
RF transmitter reaction
IPM reaction
Synch.
Push on one of the RF key button
Emission of a « normal » frame
Synchronization:RF frame reception and processingIdentifier comparisonCalculation and memorization of the rolling codeCentral Locking feedback actionFeedback information on the tool’s screenSynchronization is done
