DTC 56-25
DTC 56-25: Lost Communication With the Gauge Control ModuleNOTE:
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures and General Troubleshooting Information.
- Check for any F-CAN and B-CAN communication DTCs, and troubleshoot those DTCs before doing this troubleshooting procedure.
1. Release the parking brake, turn the ignition switch to ON (II), and see if the brake system light comes on for 2 seconds and then goes off.
Does the brake system light come on?
YES - Go to step 2.
NO - Faulty gauge control module. Do the gauge control module self-diagnostic function.
2. Clear the DTC memory.
3. Turn the ignition switch to ON (II), then wait for 10 seconds.
4. Read the DTC.
Is DTC 56-25 indicated?
YES - Go to step 5.
NO - Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. Troubleshooting Intermittent Failures If another DTC is indicated, troubleshoot the DTC.
5. Turn the ignition switch to LOCK (0).
6. Do the battery terminal disconnection procedure and wait for 3 minutes.
7. Disconnect SRS unit connector A (28P) from the SRS unit.
8. Disconnect gauge control module connector A (32P) from the gauge control module.
9. Install a jumper wire between the No. 16 and the No. 17 terminals of SRS unit connector A (39P).
10. Measure the resistance between the No. 29 and the No. 30 terminals of gauge control module connector A (32P). There should be 0 - 1.0 ohms.
Is the resistance as specified?
YES - Faulty SRS unit or poor connection at SRS unit connector A (39P) and the SRS unit. Check the connection between the connector and the SRS unit. If the connection is OK, replace the SRS unit.
NO - Open between the No. 16 terminal of SRS unit connector A (39P) and the No. 29 terminal of gauge control module connector A (32P), or between the No. 17 terminal of SRS unit connector A (39P) and the No. 30 terminal of gauge control module connector A (32P); replace the faulty harness.