DTC U0155-00

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 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

DTC (SRS)

Body electrical system check

-1. Check for any F CAN and B CAN communication DTCs with the HDS.

DTC Description	DTC

Are there any communication DTCs?

YES

Go to the appropriate DTC troubleshooting.

Go to step 2.

Brake system indicator check
-1. Release the parking brake, press the engine start/stop button to select 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 .

DTC check

-1. Clear the DTCs with the HDS .

-2. Press the engine start/stop button to select 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 (without color multi-information display)

Go to step 4.

YES (with color multi-information display)

Go to step 5.

Intermittent failure, the system is OK at this time. Go to Troubleshooting Intermittent Failures . If another DTC is indicated, troubleshoot the DTC.

Open wire check (F CAN-H, F CAN-L lines)

-1. Press the engine start/stop button to select the OFF mode.

-2. Disconnect the negative cable from the battery, then wait at least 3 minutes.

-3. Disconnect the following connectors.

SRS unit connector A (39P)

Gauge control module 32P connector

-4. Check for continuity between test points 1 and 2.

Test condition	OFF mode
	SRS unit connector A (39P): disconnected
	Gauge control module 32P connector: disconnected
Test circuit	F CAN-H
Test point 1	SRS unit connector A (39P) No. 20
Test point 2	Gauge control module 32P connector No. 23 (WHT)

Test circuit	F CAN-L
Test point 1	SRS unit connector A (39P) No. 21
Test point 2	Gauge control module 32P connector No. 24 (RED)

Courtesy of HONDA, U.S.A., INC.

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.

Open in the harness between SRS unit connector A (39P) terminal No. 20 and gauge control module 32P connector terminal No. 23, or between SRS unit connector A (39P) terminal No. 21 and gauge control module 32P connector terminal No. 24; replace the dashboard wire harness, then clear the DTC.