DTC B1194

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1194 : HUD Lost Communication with Gauge Control Module (UART Connection)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

DTC Description	DTC
B1194 HUD lost communication with gauge control module (UART connection)

DTC (Head Up Display)

Problem verification

-1. Clear the DTCs with the HDS.

-2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

-3. Wait for at least 6 seconds.

-4. Check for DTCs with the HDS.

DTC Description	DTC
B1194 HUD lost communication with gauge control module (UART connection)

Is DTC B1194 indicated?

YES

Go to step 2.

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

Open wire check (HUD UART line)

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

-2. Disconnect the following connectors.

Gauge control module connector A (32P)

Head up display 20P connector

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected Head up display 20P connector: disconnected
Test point 1	Gauge control module connector A (32P) No. 25
Test point 2	Head up display 20P connector No. 13

Is there continuity?

YES

Go to step 3.

An open or poor connection in the HUD UART wire between the gauge control module and the head up display.

Shorted wire check (HUD UART line)

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

Test condition	Vehicle OFF (LOCK) mode Gauge control module connector A (32P): disconnected Head up display 20P connector: disconnected
Test point 1	Gauge control module connector A (32P) No. 25
Test point 2	Body ground

Is there continuity?

YES

Repair a short to ground in the wire.

Replace the gauge control module .