The deactication system for the passenger airbag consists of the SRSCM and the Passenger Airbag Deactivation(PAD) switch. The above DTC is recored when PAD switch open or short to battery is detected in the PAD circuit.
DTC | Condition | Probable cause |
B1527 | ● Short to battery line between PAD switch and SRSCM ● SRSCM mMalfunction ● PAD switch malfunction | ● PAD switch ● Wiring harness ● SRSCM |
PAD Switch Status | Current (mA) | Related DTC |
Open or Short to Battery | ＜ 2.71 | B1527 |
PAB Enabled Position | 2.96 ~ 5.01 | |
Defect | 5.46 ~ 6.68 | B1529 |
PAB Disabled Position | 7.28 ~ 12.73 | |
Short or Short to Ground | ＞ 13.87 | B1528 |
Refer to the DESCRIPTION in this TROUBLESHOOTING part.
PREPARATION
Refer to the DESCRIPTION in this TROUBLESHOOTING part.
CHECK OPEN CIRCUIT
Disconnect the connector of the PAD switch.
Measure resistance between the terminal 71 of the SRSCM harness connector and 1 of PAD switch connector.
Specification (resistance) : below 1 Ω
Is the measured resistance within specification?
▶ Check short to battery line.
▶ Replace the harness between the SRSCM and the PAD switch.
CHECK SHORT TO BATTERY LINE
Connect the battery negative cable to the battery.
Turn the ignition switch to ON.
Turn the ignition switch to LOCK, and wait for 30 seconds.
Measure voltage between the terminal 1 of PAD switch harness connector and chassis ground.
Specification (voltage) : Approximately 0 V
Is the measured voltage within specification?
▶ Go to next step.
▶ Repair or replace the wiring harness between the PAD switch and the SRSCM.
CHECK THE PAD SWITCH
Connect the SRSCM connector.
Connect the PAD switch.
Connect the battery negative cable to the battery.
Turn the ignition switch to ON.
Measure current between the terminal 71 of the SRSCM harness connector and 1 of PAD switch connector.
Specification (current) :
PAD switch (Enabled position) : 2.96 ~ 5.01 mA
PAD switch (Disabled position) : 7.28 ~ 12.73 mA
Is the measured current within specification?
▶ Go to next step.
▶Replace the PAD switch.
CLEAR THE DTC AND CHECK THE VEHICLE AGAIN
Refer to the DESCRIPTION in this TROUBLESHOOTING part.
