SRS indicator stays on, but no DTCs are stored, or cannot be read (2017 2018 2019 2020)

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. Go to:SRS Component Replacement/Inspection After Deployment .
• Before doing this troubleshooting procedure, make sure the Battery is fully charged - Refer to: Battery Test (2016 2017 2018 2019 2020), . 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. - Refer to: Battery Terminal Disconnection and Reconnection (2016 2017 2018 2019 2020) .
• 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.

1. 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.

2. 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 3.

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: DTC U0151 (2019 2020), or DTC U0151 (Gauge Control Module (Without CAN Gateway)) (2016 2017 2018 2019 2020) or DTC U0151 (Gauge Control Module (With CAN Gateway)) (2016 2017 2018) .

   NO 

   Go to step 4.

4. Fuse check 1

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

   - 2. Check the following fuses.

   Fuse	No. E19 (10 A)
   Location	Passenger's under-dash fuse/relay box

   Is the fuses OK?

   YES 

   Go to step 5.

   NO 

   Replace the fuses, then turn the vehicle to the ON mode.

   If the fuse blows again, check for a short to ground in the passenger's under-dash fuse/relay box No. E19 (10 A) fuses circuit (dashboard wire harness, floor wire harness, or front passenger's seat wire harness);

   replace the faulty harness, and retest. If the problem is still present, replace the passenger's under-dash fuse/relay box - Refer to: Passenger's Under-Dash Fuse/Relay Box Removal and Installation .

5. Fuse check 2

   - 1. Check the following fuses.

   Fuse	No. D22 (15 A)
   Location	Driver's under-dash fuse/relay box

   Is the fuses OK?

   YES 

   Go to step 6.

   NO 

   Replace the fuses, then turn the vehicle to the ON mode. If the fuse blows again, check for a short to ground in the driver's under-dash fuse/relay box No. D22 (15 A) fuses circuit (dashboard wire harness); replace the dashboard wire harness, and retest. If the problem is still present, replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation .

6. Open wire check (VB lines)

   - 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. 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 circuit	VB
   Test point 1	SRS unit connector A (39P) No. 39 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020) .
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The VB wires are OK. Go to step 7.

   NO 

   Open in the dashboard wire harness or faulty passenger's under-dash fuse/relay box; replace the dashboard wire harness or the passenger's under-dash fuse/relay box - Refer to: Passenger's Under-Dash Fuse/Relay Box Removal and Installation .

7. Open wire check (SGND 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
   	SRS unit connector A (39P): disconnected
   Test circuit	SGND
   Test point 1	SRS unit connector A (39P) No. 36 - Refer to: SRS Unit Connector for Inputs and Outputs (2017 2018 2019 2020)
   Test point 2	Body ground

   Is there 1.0 Ω or less?

   YES 

   The SGND wires are OK. Replace the SRS unit - Refer to: SRS Unit Removal and Installation (2017 2018 2019 2020),

   NO 

   Open in the dashboard wire harness; check for a poor ground at G503. If the ground is OK, replace the dashboard wire harness.