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 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 .
• SRS unit with a history that has detected the collision, turns on the SRS indicator. The internal components of the SRS unit are damaged and must be replaced.

1. HDS communication 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, then wait for 10 seconds.

   -4. Check the HDS communication with the vehicle.

   Does the HDS communication with the vehicle?

   YES 

   Go to step 2.

   NO 

   Go to DLC circuit troubleshooting .

2. HDS communication check 2

   -1. Check select the SRS system, in the HDS system selection menu.

   Can the SRS be selected in the System Selection Menu?

   YES 

   Go to step 3.

   NO 

   Go to step 5.

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
   U0151-00 Gauge control module lost communication with SRS unit

   Is DTC U0151 indicated?

   YES 

   Go to DTC U0151 troubleshooting .

   NO 

   Check the SRS indicator drive circuit by performing self-diagnostic function of the gauge control module . If the SRS indicator does not brink properly, replace the gauge control module .

5. Fuse check

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

   -2. Check the following fuse.

   Fuse	No. D35 (10 A)
   Location	Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   Go to step 6.

   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. C35 (10 A) 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.

6. SRS unit power supply circuit check 1(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 7.

   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 .

7. SRS unit power supply circuit check 2(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. 36
   Test point 2	Body ground

   Is there 1.0 Ω or less?

   YES 

   The GND wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the SRS unit .

   NO 

   Open in the dashboard wire harness; check for a poor ground at G305. If the ground is OK, replace the dashboard wire harness.