Disarming/Service and Repair, General Troubleshooting Information See: Restraints and Safety Systems/Air Bag Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes, and Battery Terminal Disconnection and Reconnection See: Starting and
Charging/Battery/Service and Repair/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 See: Restraints and Safety Systems/Air Bag Systems/Testing and Inspection/Programming and Relearning/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. Clear the DTCs with the HDS.
3. Turn the ignition switch to ON (II), then wait for 10 seconds.
4. Check for DTCs with the HDS.
Is DTC 56-26 or 56-27 indicated?
YES -
Faulty gauge control module. Do the gauge control module self-diagnostic function See: Instrument Panel, Gauges and Warning
Indicators/Instrument Cluster / Carrier/Testing and Inspection/Initial Inspection and Diagnostic Overview, then clear the DTC. If the gauge control
module fails the self-diagnostic, replace the gauge control module, then clear the DTC. If the DTC is still present, replace the SRS unit See: Relays
and Modules/Relays and Modules - Restraints and Safety Systems/Air Bag Control Module/Service and Repair/SRS Unit Replacement.?
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.?
56-31
SRS DTC Troubleshooting: 56-21, 56-31, 56-22, 56-53, 56-32, 56-33
DTC 56-21, 56-31:
Lost Communication With the PCM (PGM-FI system)
DTC 56-22, 56-23, 56-32, 56-33:
Undefined Data Received From the PCM (PGM-FI system)
NOTE:
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures See: Body and Frame/Air Bag(s) Arming and
Disarming/Service and Repair, General Troubleshooting Information See: Restraints and Safety Systems/Air Bag Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes, and Battery Terminal Disconnection and Reconnection See: Starting and
Charging/Battery/Service and Repair/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 See: Restraints and Safety Systems/Air Bag Systems/Testing and Inspection/Programming and Relearning/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. Clear the DTCs with the HDS.
