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 of the SRS warning light.
HINT:
- 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 CAN communication system to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, there may be an hybrid vehicle control ECU malfunction.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM
(a) Check if a CAN communication system DTC is output Diagnosis System.
Result:






B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.
2. CHECK WIRE HARNESS (DLC3 - HYBRID VEHICLE CONTROL ECU)




(a) Turn the power switch off.
(b) Disconnect the connector from the hybrid vehicle control ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






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




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






NG -- REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)
OK -- Continue to next step.
4. CHECK WIRE HARNESS (TC OF DLC3 - BODY GROUND)




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






Result:






C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- REPAIR OR REPLACE WIRE HARNESS OR EACH ECU