SRS Symptom Troubleshooting - SRS indicator stays on, but no DTCs are stored, or cannot be read
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.
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, and retest.
1.
PGM-FI system check:

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
     
     
     
     
NO
     
     
     
Go to step 2.
2.
System check 1:

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:

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:

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
     
     
     
     
NO
     
     
     
Go to step 5.
5.
Gauge control module check:

Gauge control module check
?1.
Do the gauge control module self-diagnostic function.

  

Does the SRS indicator blink?

     
YES
     
     
     
     
NO
     
     
     
6.
Fuse check:

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 (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.?
7.
Connector connection check:

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 2:

System check 2
?1.
Repair the poor connector connections whichever 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 go 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):

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):

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 ? 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.?