SRS indicator stays on, but no DTCs are stored, or cannot be read

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 (see COMPONENT REPLACEMENT/INSPECTION AFTER DEPLOYMENT ).
Before doing this troubleshooting procedure, make sure the 12 volt battery is fully charged. If the 12 volt battery voltage is low, SRS indicator may stays on.
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 SRS UNIT UPDATE ), and retest.

Turn the ignition switch to ON (II).
Start the engine, and see if the malfunction indicator lamp (MIL) also stays on.
Does the MIL stay on longer than 30 seconds?

YES -Go to the MIL Circuit Troubleshooting (see MIL CIRCUIT TROUBLESHOOTING ).

NO -Go to step 3.
Turn the ignition switch to LOCK (0).
Connect the HDS to the data link connector (DLC) (see DTC (DIAGNOSTIC TROUBLE CODES) ).
Turn the ignition switch to ON (II).
Make sure the HDS communicates with the vehicle and the SRS unit. If it does not communicate, troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Are any SRS DTCs indicated?

YES -Do the SRS DTC troubleshooting.

NO -Go to step 8.
From the HDS Main Menu, select BODY ELECTRICAL, then select the desired MODE MENU.
Check for DTCs with the HDS (see HOW TO CLEAR DTCS ).
Is DTC U0151 indicated?

YES -Troubleshoot DTC U0151 (see DTC U0151: GAUGE CONTROL MODULE LOST COMMUNICATION WITH SRS UNIT ).

NO -Go to step 10.
Do the gauge control module self-diagnostic function (see SELF-DIAGNOSTIC FUNCTION ).
Does the SRS indicator come on?

YES -Faulty SRS unit; replace the SRS unit (see SRS UNIT REPLACEMENT ).

NO -Faulty gauge control module; replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).