SRS - 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.

Problem verification
-1. Turn the vehicle to the OFF (LOCK) mode, then wait for 10 seconds.

-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

The failure is duplicated. Go to step 2.

DTC check

-1. Check for DTCs with the HDS.

DTC Description	DTC

Are any SRS DTCs indicated?

YES

Go to SRS DTC troubleshooting.

Go to step 3.

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 .

Go to step 4.

Fuse check

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

-2. Check the following fuse.

Fuse	No. C10 (10 A)
Location	Under-dash fuse/relay box

Is the fuse OK?

YES

Go to step 5.

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. C10 (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 .

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
Test condition	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 6.

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 .

Open wire check (SGND 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
Test condition	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 SGND wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or replace the SRS unit .

Open in the dashboard wire harness; check for a poor ground at G403. If the ground is OK, replace the dashboard wire harness.