DTC U0155-00: Lost Communication With the Gauge Control Module
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, 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.
| DTC Description | DTC |
|---|---|
| U0155-00 Lost communication with the gauge control module |
- 1. Body electrical system check:
1. Check for any F-CAN and B-CAN communication DTCs with the HDS.
Are there any communication DTCs?
YES
Go to the appropriate DTC troubleshooting.
NO
Go to step 2.
- 2. Brake system indicator check:
1. Release the parking brake, turn the vehicle to the ON mode, and see if the brake system indicator comes on for 2 seconds and then goes off.
Does the brake system indicator come on and then go off after 2 second?
YES
Go to step 3.
NO
Do the gauge control module self-diagnostic function . If gauge control module has the problem, replace the gauge control module , then clear the DTC, and retest. If the DTC is still present, replace the SRS unit .
- 3. DTC check:
1. Clear the DTCs with the HDS .
2. Turn the vehicle to the ON mode, then wait for 10 seconds.
3. Check for DTCs with the HDS .
DTC Description DTC U0155-00 Lost communication with the gauge control module Is DTC U0155-00 indicated?
YES
Go to step 4.
NO
Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures . If another DTC is indicated, troubleshoot the DTC.
- 4. Open wire check (F-CAN_H, F-CAN_L lines):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the negative cable from the 12 volt battery, then wait at least 3 minutes.
3. Disconnect the following connectors.
SRS unit connector A (39P) Gauge control module connector A (32P) 4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode SRS unit connector A (39P): disconnected Gauge control module connector A (32P): disconnected Test point 1 SRS unit connector A (39P) No. 20 Test point 2 Gauge control module connector A (32P) No. 19 Test point 1 SRS unit connector A (39P) No. 21 Test point 2 Gauge control module connector A (32P) No. 20 Is there continuity?
YES
The F-CAN_H and F-CAN_L wires are OK. Faulty SRS unit or poor connection at SRS unit connector A (39P) and the SRS unit. Check the connection; if the connection is OK, replace the SRS unit . If the DTC does not clear, replace the dashboard wire harness.
NO
Open in the harness between SRS unit connector A (39P) terminal No. 20 and gauge control module connector A (32P) terminal No. 19, or between SRS unit connector A (39P) terminal No. 21 and gauge control module connector A (32P) terminal No. 20; replace the dashboard wire harness, then clear the DTC.