56-25
SRS DTC Troubleshooting: 56-25
DTC 56-25:
Lost Communication With the Gauge Control Module
NOTE:
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures Service and Repair, General Troubleshooting Information Reading and Clearing Diagnostic Trouble Codes, and Battery Terminal Disconnection and Reconnection Procedures.
- 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 SRS Unit Update, and retest.
1. Check for any F-CAN and B-CAN communication DTCs with the HDS.
Are there any communication DTCs?
YES -
Go to the appropriate DTC troubleshooting.
NO -
Go to step 2.
2. Release the parking brake, turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and see if the brake system light comes on for 2 seconds and then goes off.
Does the brake system light come on and then go off after 2 second?
YES -
Go to step 3.
NO -
Faulty gauge control module. Do the gauge control module self-diagnostic function Initial Inspection and Diagnostic Overview. If the gauge control module fails the self-diagnostic function, replace the gauge control module Service and Repair, then clear the DTC. If the DTC is still present, replace the SRS unit SRS Unit Replacement.�
3. Clear the DTC with the HDS Reading and Clearing Diagnostic Trouble Codes.
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then wait for 10 seconds.
5. Check for DTCs with the HDS Reading and Clearing Diagnostic Trouble Codes.
Is DTC 56-25 indicated?
YES -
Go to step 6.
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.�
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the negative cable from the battery, then wait at least 3 minutes.
8. Disconnect SRS unit connector A (39P) from the SRS unit Service and Repair.
9. Disconnect the gauge control module 32P connector from the gauge control module Service and Repair.
10. Check for continuity between SRS unit connector A (39P) terminal No. 16 and gauge control module 32P connector terminal No. 9, and between SRS unit connector A (39P) terminal No. 17 and gauge control module 32P connector terminal No. 10.
Is there continuity?
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 SRS Unit Replacement.�
NO -
Open in the harness between the SRS unit connector A (39P) terminal No. 16 and gauge control module 32P connector terminal No. 9, or between the SRS unit connector A (39P) terminal No. 17 and terminal No. 10; replace the faulty harness.�