Honda HR-V Owners & Service Manuals

Honda HR-V: DTC C1850-12 (44-12): Fail Safe Relay Stuck ON (AWD)

Honda HR-V (2015-2021) Service Manual / Driveline & Axles / AWD System - Diagnostics / DTC C1850-12 (44-12): Fail Safe Relay Stuck ON (AWD)

NOTE: Before you troubleshoot, review the General Troubleshooting Information for the AWD with intelligent control system.

AWD System - Diagnostics

1. Problem verification:

  1. Turn the vehicle to the ON mode.
  2. Check the parameter(s) below with the HDS.

AWD System - Diagnostics

AWD System - Diagnostics

Do the current condition(s) match the threshold?

YES

The failure is duplicated. Go to step 2.

NO

Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. AWD relay check:

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Remove the AWD relay, then test it.

Is the AWD relay OK?

YES

The AWD relay is OK. Go to step 3.

NO

Replace the AWD relay.

3. Shorted wire check (FSR line):

  1. Disconnect the following connector.

AWD control unit 24P connector

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

AWD System - Diagnostics

AWD System - Diagnostics

Is there continuity?

YES

Repair a short to ground in the FSR wire between the AWD relay and the AWD control unit.

NO

The FSR wire is OK. Go to step 4.

4. Shorted wire check (PWR line to power):

  1. Turn the vehicle to the ON mode.
  2. Measure the voltage between test points 1 and 2.

AWD System - Diagnostics

AWD System - Diagnostics

Is there about 0.1 V or less?

YES

Update the AWD control unit if it does not have the latest software, or substitute a known-good AWD control unit, and recheck. If the symptom/indication goes away with the updated AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit.

NO

Repair a short to power in the PWR wire between the AWD relay and the AWD control unit.

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