DTC 71

DTC 71 - Side Air Bag Module (RH) (Squib) System

DTC 71, 72, 75, 76 - Side Air Bag Module (RH) (squib) System:

Connector - C-74, D-19:

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. It the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the sating G-sensor is on, the SRS air bag will inflate.

The ignition signal is input to the air bag module to inflate the air bag.




DTC SET CONDITIONS
These diagnostic trouble codes are output if there is abnormal resistance between the input terminals of the side air bag module (RH) (squib). The most likely causes for this code to be set are shown in the table:

TROUBLESHOOTING HINTS
- Damaged wiring harnesses or connectors
- Malfunction of the side air bag module (RH) (squib)
- Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:
MB991502: Scan Tool (MUT-II)
MB991613: SRS Check Harness




STEP 1. Check the side air bag module line using the scan tool and MB991613 SRS Check harness.
1. Disconnect side air bag module (RH) connector D-19.
2. Connect special tool MB991613 connector (1).
3. Erase the diagnostic trouble code memory. Is code number 71, 72, 75 or 76 output?

If yes, go to Step 2.

If no output, replace the seat back assembly of the front seat (RH). Refer to Front Seat. Then go to Step 3.




STEP 2. Check the harness wires between SRS-ECU connector C-74 and side air bag module (RH) connector
If harness wires are in good condition, go to Step 3.

If any harness wires between SRS-ECU connector C-74 and side air bag module (RH) connector D-19 are damaged, repair them. Then go to Step 3.




STEP 3. Check the diagnostic trouble codes.
Confirm that diagnostic trouble codes 71, 72, 75 and 76 are not output.