The deactivation system for the passenger airbag consists of the SRSCM and the Passenger Airbag Deactivation(PAD) switch. The above DTC is recored when PAD switch short or short to ground is detected in the PAD system circuit.
DTC | Condition | Probable cause |
B1528 | ● Short to ground between PAD switch and SRSCM ● PAD switch malfunction ● SRSCM 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 SHORT TO GROUND
Disconnect the connector of the PAD switch.
Measure resistance between the terminal 1 of PAD switch connector and chassis ground.
Specification (resistance) : infinite
Is the measured resistance within specification?
▶ Check short circuit.
▶ Replace the harness between the SRSCM and the PAD switch.
CHECK SHORT CIRCUIT
Measure resistance between 1 and 2 of PAD switch connector.
Measure resistance between 1 and 4 of PAD switch connector.
Specification (resistance) : infinite
Is the measured resistance 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 positon) : 2.96 ~ 5.01 mA
PAD switch (Disabled positon) : 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.
