DTC Description

The CAB squib circuit consists of the SRSCM and two Curtain Airbags(CAB). It causes the SRS to deploy when the SRS deployment conditions are satisfied. The above DTC is recorded when the CAB resistance too high or low is detected in the CAB squib circuit.

DTC Detecting Condition

DTC

Condition

Probable cause

B1473

B1474

B1477

B1478

●

Too high or low resistance between CAB high(+) and CAB low(-)

●

Curtain Airbag (CAB) Malfunction

●

SRSCM Malfunction

●

Open or short circuit on wiring harness

●

Curtain Airbag (CAB) squib

●

SRSCM

Specification

CAB resistance : 1.940 ~ 2.704 Ω(Driver), 1.948 ~ 2.712 Ω(Passenger)

Schematic Diagram
Terminal ＆ Connector Inspection

Refer to the DESCRIPTION in this TROUBLESHOOTING part.

Inspection Procedure
1.

PREPARATION

Refer to the DESCRIPTION in this TROUBLESHOOTING part.

2.

CHECK CAB RESISTANCE

caution

Never attempt to measure the circuit resistance of the airbag module(squib) even if you are using the specified tester.

(1)

Connect the Dummy and the Dummy Adapter on CAB harness connector.

● Refer to "SPECIAL SERVICE TOOL" section in this SERVICE MANUAL for the SST No. of Dummy and Dummy Adapter.

(2)

Measure resistance between the terminal 2(12) and 1(11) of SRSCM harness connector(B).

CAB resistance : 1.940 ~ 2.704 Ω(Driver), 1.948 ~ 2.712 Ω(Passenger)

(3)

Is the measured resistance within specification?

▶Replace the Curtain Airbag(CAB) module.

▶Check open circuit.

3.

CHECK OPEN CIRCUIT

(1)

Measure resistance between the terminal 2 of CAB harness connector and the terminal 2(12) of SRSCM harness connector(B).

(2)

Measure resistance between the terminal 1 of CAB harness connector and the terminal 1(11) of SRSCM harness connector(B).

Specification (resistance) : below 1 Ω

(3)

Is the measured resistance within specification?

▶Check short circuit.

▶Repair or replace the wiring harness between the CAB and the SRSCM.

4.

CHECK SHORT CIRCUIT

(1)

Measure resistance between the terminal 1 and 2 of CAB harness connector.

Specification (resistance) : infinite

(2)

Is the measured resistance within specification?

▶ Go to next step.

▶ Repair or replace the wiring harness between the CAB and the SRSCM.

5.

CLEAR THE DTC AND CHECK THE VEHICLE AGAIN

Refer to the DESCRIPTION in this TROUBLESHOOTING part.

Яндекс.Метрика