Component Tests and General Diagnostics

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: Diagnosis Circuit

Diagnosis Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking the SRS warning light.
HINT:
- Make sure that DTC B1281 has not been output. If DTC B1281 has been output, refer to the multiplex communication system.
- When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
- A DTC output mode signal is transmitted through BEAN to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, it can be suspected that there is an ECM malfunction.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (TC OF DLC3 - TC OF ECM)





(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the H29 connector from the ECM.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF HYBRID VEHICLE CONTROL ECU)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)





(a) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)
OK -- Continue to next step.
3. CHECK WIRE HARNESS (TC OF HYBRID VEHICLE CONTROL ECU - BODY GROUND)





(a) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS OR EACH ECU
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY