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 56-21, 56-31, 56-22, 56-23, 56-32, or 56-33 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures. If another DTC is indicated, troubleshoot the DTC.?
5. Turn the ignition switch to ON (II), and see if the malfunction indicator lamp (MIL) comes on.
Does the MIL stay on longer than 30 seconds?
YES -
Go to the MIL Circuit Troubleshooting See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests
and General Diagnostics/MIL Circuit Troubleshooting.?
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection
and Diagnostic Overview.
NOTE: This step must be done to protect the PCM from damage.
8. Disconnect PCM connector A (49P) from the PCM See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Initial Inspection and Diagnostic Overview.
9. Disconnect the negative cable from the battery, then wait at least 3 minutes.
10. Disconnect SRS unit connector A (39P) from the SRS unit.
11. Check for continuity between SRS unit connector A (39P) terminals No. 16 and No. 17 and PCM connector A (49P) terminals No. 48 and
