SRS System

Control System DTCs

SRS DTC Troubleshooting: 81-79

DTC 81-79 : Front Passenger's Weight Sensors Initial Check Failure

NOTE:
* Before doing this troubleshooting procedure, find out if the vehicle was in a collision. If so, verify that all the required components were replaced with new components, of the correct part number, and that they were properly installed Service and Repair.
* Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair and General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes.
* Before replacing the SRS unit, check the SRS unit software version with the HDS. If the software version is not the latest, update the SRS unit software Programming and Relearning, and retest.
* These DTCs are codes that relate to the front passenger's weight sensor operation.

1. Problem verification:

Problem verification
-1. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-2. Turn the ignition switch to ON (II), then wait for 10 seconds.

-3. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 81-79 indicated?
-YES- The failure is duplicated. Go to step 2.
-NO- Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures Reading and Clearing Diagnostic Trouble Codes. If another DTC is indicated, troubleshoot the DTC.

2. System check 1:

System check 1
-1. Make sure nothing is on the front passenger's seat.

-2. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-3. Turn the ignition switch to ON (II), then wait for 10 seconds.

-4. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 81-79 indicated?
-YES- Go to step 3.
-NO- The system is OK at this time.

3. System check 2:

System check 2
-1. Turn the ignition switch to LOCK (0).

-2. Loosen the front passenger's seat mounting bolts, and shake the seat in all directions. Tighten the seat mounting bolts to the specified torque Front Seat Removal and Installation - Passengers Seat.

-3. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-4. Do the front passenger's weight sensor initialization Programming and Relearning.

-5. Turn the ignition switch to ON (II), then wait for 10 seconds.

-6. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 81-79 indicated?
-YES- Go to step 4.
-NO- The system is OK at this time.

4. System check 3:

System check 3
-1. Replace the front passenger's weight sensor assembly Front Passengers Weight Sensor Removal and Installation (2-door).

-2. Clear the DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

-3. Turn the ignition switch to ON (II), then wait for 10 seconds.

-4. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.

Is DTC 81-79 indicated?
-YES- Replace the ODS unit Service and Repair, then clear the DTC, and retest. If the DTC is still present, replace the SRS unit Service and Repair.
-NO- The system is OK at this time.