DTC C1850-12 (44-12) (AWD)

DTC C1850-12  : Fail Safe Relay Stuck ON

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

DTC (AWD)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Voltage of Battery	More than 8.3	V

   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

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

   Test condition	Vehicle OFF (LOCK) mode
   	AWD relay: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD relay 4P socket No. 4
   Test point 2	Body ground

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

   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.

   Test condition	Vehicle ON mode
   	AWD relay: disconnected
   	AWD control unit 24P connector: disconnected
   Test point 1	AWD relay 4P socket No. 2
   Test point 2	Body ground

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

   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.