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 the 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. Thus when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* w/ Navigation System (for HDD):
After the power switch is turned OFF, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch OFF, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

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 CAN Communication System
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)





(a) Turn the power switch OFF.

(b) Disconnect the A13 connector from the ECM.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (TC OF ECM - BODY GROUND)





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal