DTC 79

DTC 79 - Side Impact Sensor (LH) Communication System

DTC 79, 93 - Side Impact Sensor (LH) Circuit:

Connector -c-74, D-12:

CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by detecting signals from the left and right side impact sensors and the analog G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the safing G-sensor is on, the SRS air bag will inflate.

DTC SET CONDITIONS
These diagnostic trouble codes are output it communication between the side impact sensor (LH) and the SRS-ECU is not possible or communication is faulty.

TROUBLESHOOTING HINTS
- Damaged wiring harnesses or connectors
- Malfunction of the side impact sensor (LH)
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the side impact sensor
1. Replace the side impact sensor (LH) with the side impact sensor (RH).
2. Erase the diagnostic trouble code memory.

If code number 79 or 93 is erased and code number 89 or 96 is output, replace the side impact sensor (LH) with a new one.

If code number 79 or 93 is erased and code number 89 or 96 is not output, go to Step 2.




STEP 2. Check the harness wires between SRS-ECU connector C-74 and side impact sensor (LH) connector D-12.
If harness wires are in good condition go to Step 3. If any harness wires between SRS-ECU connector C-74 and side impact sensor (LH) connector D-12 are damaged, repair them or install the sensor cable. Then go to Step 3.

Connector - D-12:

STEP 3. Check for any diagnostic trouble codes.
Confirm that diagnostic trouble code 79 and 93 are not output.