SRS Symptom Troubleshooting - SRS indicator stays on, but no DTCs are stored, or cannot be read(Except Touring)
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:
- 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 - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
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 .
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 blink?
YES
NO
- 6. Fuse check:
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Check the following fuses.
Fuse No. B3 (10 A) Location Under-dash fuse/relay box Are the fuses 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. B3 (10 A) fuse circuit (dashboard wire harness or floor wire harness); replace the faulty 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 H (4P) Are the connectors OK?
YES
Go to step 9.
NO
Go to step 8.
- 8. System check:
- 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 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 12 volt 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 G504. If the ground is OK, replace the dashboard wire harness.