SRS - SRS Indicator Stays "On", But No DTCS Are Stored, Or Cannot Be Read (2016 2017 2018 2019 2020 2021 2022)
- 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 battery is fully charged . If the battery voltage is low, SRS indicator may stay on.
- Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information , and 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.
- 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.
- System check 1
-1. Press the engine start/stop button to select the OFF mode.
-2. Connect the HDS to the data link connector (DLC) .
-3. Press the engine start/stop button to select 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.
- 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.
- 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.
- Gauge control module check
-1. Do the gauge control module self-diagnostic function .
Self diagnostic function
Does the SRS indicator blinkΩ
YES
NO
- Fuse check
-1. Press the engine start/stop button to select the OFF mode.
-2. Check the following fuse.
Fuse No. B3 (10 A) Location Under-dash fuse/relay box Is the fuse OK?
YES
Go to step 7.
NO
Replace the fuse, then press the engine start/stop button to select 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); replace the dashboard wire harness, and retest. If the problem is still present, replace the under-dash fuse/relay box .
- 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.
- System check 2
-1. Reset the loose connector connections whichever was cause of the problem in step 7.
-2. Press the engine start/stop button to select 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
Press the engine start/stop button to select the OFF mode, go to step 9.
- Open wire check (VB line)
-1. Disconnect the negative cable from the battery, then wait at least 3 minutes.
-2. Disconnect the following connector.
SRS unit connector A (39P) -3. Reconnect the negative cable to the battery.
-4. Press the engine start/stop button to select the ON mode.
-5. Measure the voltage between test points 1 and 2.
Test condition ON mode SRS unit connector A (39P): disconnected Test circuit VB 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 .
- Open wire check (GND line)
-1. Press the engine start/stop button to select the OFF mode.
-2. Measure the resistance between test points 1 and 2.
Test condition OFF mode SRS unit connector A (39P): disconnected Test circuit GND 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 G505. If the ground is OK, replace the dashboard wire harness.