SRS Indicator Stays On, But No DTCs Are Stored, Or Cannot Be Read (2018-19)

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 - Refer to: SRS Component Replacement/Inspection After Deployment (2018-19) .
Before doing this troubleshooting procedure, make sure the Battery is fully charged - Refer to: 12 Volt Battery Test (Without SH-AWD), or 12 Volt Battery Test (With SH-AWD) . If the Battery voltage is low, SRS indicator may stay on.
Before doing this troubleshooting procedure, review SRS Precautions and Procedures , General Troubleshooting Information - Refer to: How to Troubleshoot the SRS (2018-19) , 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 Gauge control module lost communication with SRS unit

Is DTC U0151 indicated?

YES

Go to DTC U0151 troubleshooting - Refer to: SRS DTC Troubleshooting Index (2018-19) .

Go to step 4.

Fuse check 1

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

- 2. Check the following fuses.

Fuse	No. B24 (10 A)
Location	Under-dash fuse/relay box

Is the fuses OK?

YES

Go to step 5.

Replace the fuses, 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. B24 (10 A) fuses circuit (dashboard wire harness, right side wire harness, or front passenger's seat wire harness); replace the faulty harness, and retest. If the problem is still present, replace the under-dash fuse/relay box .

Open wire check (VB lines)

- 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 - Refer to: SRS Unit Connector for Inputs and Outputs (2018-19)
Test point 2	Body ground

Is there battery voltage?

YES

The VB wires are 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 (GND lines)

- 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 - Refer to: SRS Unit Connector for Inputs and Outputs (2018-19)
Test point 2	Body ground

Is there 1.0 Ω or less?

YES

The GND wires are OK. Replace the SRS unit - Refer to: SRS Unit Removal and Installation (2018-19) .

Open in the dashboard wire harness; check for a poor ground at G308. If the ground is OK, replace the dashboard wire harness.

Also check for

Check the deployed history - Refer to: How to Troubleshoot the SRS (2018-19) .
Charging system for under or overcharging
Communication with the HDS