DTC C0023-12

DTC C0023-12  : Brake Diag Circuit ON Failure

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC (VSA)

1. Brake light relay check

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

   -2. Check the brake lights without pressing the brake pedal.

   Are the brake lights on?

   YES 

   Replace the relay circuit board (built-in brake light relay) .

   NO 

   Go to step 2.

2. Shorted wire check (BRK LAMP line) 1

   -1. Turn the vehicle to the ON mode.

   -2. Check the brake lights without pressing the brake pedal.

   Are the brake lights on?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Shorted wire check (BRK LAMP line) 2

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

   -2. Disconnect the following connector.

   VSA modulator-control unit 46P connector

   -3. Turn the vehicle to the ON mode.

   -4. Check the brake lights without pressing the brake pedal.

   Are the brake lights on?

   YES 

   Repair a short to body ground in the wire between the VSA modulator-control unit and the relay circuit board (built-in brake light relay).

   NO 

   Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

4. Problem verification

   -1. Clear the DTC with the HDS.

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

   -3. Press the brake pedal for 3 seconds or more.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   C0023-12 Brake Diag Circuit ON Failure

   Is DTC C0023-12 indicated?

   YES 

   The failure is duplicated. Go to step 5.

   NO 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting .

5. Open wire check (STOP SW line)

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

   -2. Jump the SCS line with the HDS, and wait for more than 1 minute.

   -3. Disconnect the following connectors.

   Brake pedal position switch 4P connector

   PCM connector A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Brake pedal position switch 4P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Brake pedal position switch 4P connector (female terminals) No. 1:
   Test point 2	PCM connector A (50P) No. 26

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

   Is there continuity?

   YES 

   The STOP SW wire is OK. Go to step 6.

   NO 

   Repair an open in the wire between the PCM and the brake pedal position switch.

6. PCM check (substitution)

   -1. Reconnect the following connectors.

   Brake pedal position switch 4P connector

   PCM connector A (50P)

   -2. Substitute a known-good PCM .

   -3. Clear the DTC with the HDS.

   -4. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.

   -5. Press the brake pedal for 3 seconds or more.

   -6. Check for DTCs with the HDS.

   DTC Description	DTC
   C0023-12 Brake Diag Circuit ON Failure

   Is DTC C0023-12 indicated?

   YES 

   Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Replace the original PCM .