Honda HR-V Owners & Service Manuals

Honda HR-V: DTC C1850-14 (44-50): Fail Safe Relay Stuck OFF (AWD)

Honda HR-V (2015-2021) Service Manual / Driveline & Axles / AWD System - Diagnostics / DTC C1850-14 (44-50): Fail Safe Relay Stuck OFF (AWD)

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

AWD System - Diagnostics

1. Problem verification:

  1. Start the engine.
  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. Fuse check:

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Check the following fuse.

AWD System - Diagnostics

Is the fuse OK?

YES

The fuse is OK. Reinstall the fuse, then go to step 3.

NO

Replace the fuse, and recheck. If the fuse blows again, repair a short to ground in the No. D2-6 (30 A) fuse circuit.

3. AWD relay check:

Remove the AWD relay, then test it.

Is the AWD relay OK?

YES

The AWD relay is OK. Go to step 4.

NO

Replace the AWD relay.

4. Open wire check (+B E-DPS line):

Measure the voltage between test points 1 and 2.

AWD System - Diagnostics

AWD System - Diagnostics

Is there battery voltage?

YES

The +B E-DPS wire is OK. Go to step 5.

NO

Repair an open in the +B E-DPS wire between the AWD relay and the No. D2-6 (30 A) fuse in the auxiliary under-dash fuse box A.

5. Open wire check (IG1 OPTION line):

  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 battery voltage?

YES

The IG1 OPTION wire is OK. Go to step 6.

NO

Repair an open in the IG1 OPTION wire between the AWD relay and the No. C39 (30 A) fuse in the under-hood fuse/relay box.

6. Shorted wire check (FSR line to power):

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Disconnect the following connector.

AWD control unit 24P connector

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

AWD System - Diagnostics

Is there about 0.1 V or less?

YES

The FSR wire is not shorted to power. Go to step 7.

NO

Repair a short to power in the FSR wire between the AWD relay and the AWD control unit, then replace the AWD control unit.

7. Open wire check (FSR line):

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Check for continuity between test points 1 and 2.

AWD System - Diagnostics

AWD System - Diagnostics

Is there continuity?

YES

The FSR wire is OK. Go to step 8.

NO

Repair an open in the FSR wire between the AWD relay and the AWD control unit.

8. Open wire check (PWR line):

Check for continuity between test points 1 and 2.

AWD System - Diagnostics

AWD System - Diagnostics

Is there continuity?

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 an open in the PWR wire between the AWD relay and the AWD control unit.

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