SRS Symptom Troubleshooting - SRS indicator stays on, but no DTCs are stored, or cannot be read (Except '19 on and after KA/KC)

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 .
• 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 stay on.
• Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and 12 Volt Battery Terminal Disconnection and Reconnection .

1. PGM-FI system check

   -1. 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 Fuel and Emissions Systems General Troubleshooting Information .

   NO 

   Go to step 2.

2. System check 1

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Connect the HDS to the data link connector (DLC) .

   -3. Turn the vehicle to the ON mode.

   -4. Check for communication to the SRS with the HDS.

   Does the HDS communicate with the SRS unit?

   YES 

   Go to step 3.

   NO 

   Go to step 6.

3. DTC check

   -1. Check for DTCs with the HDS .

   DTC Description	DTC

   Are any SRS DTCs indicated?

   YES 

   Go to SRS DTC troubleshooting.

   NO 

   Go to step 4.

4. Body electrical system DTC check

   -1. Check for body electrical DTCs with the HDS .

   DTC Description	DTC
   U0151 Gauge control module lost communication with SRS unit

   Is DTC U0151 indicated?

   YES 

   Go to DTC U0151 troubleshooting .

   NO 

   Go to step 5.

5. Gauge control module check

   -1. Do the gauge control module self-diagnostic function .

   Self diagnostic function

   Does the SRS indicator blinkΩ

   YES 

   Replace the SRS unit .

   NO 

   Replace the gauge control module .

6. Fuse check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check the following fuse.

   Fuse	No. C28 (10 A)
   Location	Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 7.

   NO 

   Replace the fuse, then turn the vehicle to the ON mode. If the fuse blows again, check for a short to ground in the under-dash fuse/relay box No. C28 fuse circuit (dashboard wire harness); replace the dashboard wire harness, and retest. If the problem is still present, replace the under-dash fuse/relay box .

7. Connector connection check

   -1. Check the following connector connections.

   SRS unit connector A (39P)

   Under-dash fuse/relay box connector J (4P)

   Are the connectors OK?

   YES 

   Go to step 9.

   NO 

   Go to step 8.

8. System check 3

   -1. Reset the loose connector connections which was cause of the problem in step 7.

   -2. Turn the vehicle to the ON mode, and check that the SRS indicator comes on for about 6 seconds and then goes off.

   Does the SRS indicator come on for about 6 seconds and then goes off?

   YES 

   The vehicle is OK at this time.

   NO 

   Turn the vehicle to the OFF (LOCK) mode, go to step 9.

9. Open wire check (VB line)

   -1. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.

   -2. Disconnect the following connector.

   SRS unit connector A (39P)

   -3. Reconnect the negative cable to the 12 volt battery.

   -4. Turn the vehicle to the ON mode.

   -5. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	SRS unit connector A (39P): disconnected
   Test point 1	SRS unit connector A (39P) No. 39
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The VB wire is OK. Go to step 10.

   NO 

   Open in the dashboard wire harness or faulty under-dash fuse/relay box; replace the dashboard wire harness or the under-dash fuse/relay box .

10. Open wire check (GND line)

    -1. Turn the vehicle to the OFF (LOCK) mode.

    -2. Measure the resistance between test points 1 and 2.

    Test condition	Vehicle OFF (LOCK) mode
    	SRS unit connector A (39P): disconnected
    Test point 1	SRS unit connector A (39P) No. 37
    Test point 2	Body ground

    Is there 1.0 Ω or less?

    YES 

    The GND wire is OK. Replace the SRS unit .

    NO 

    Open in the dashboard wire harness; check for a poor ground at G405. If the ground is OK, replace the dashboard wire harness.