DTC C0023-12
DTC C0023-12 : Brake Diag Circuit ON Failure
NOTE: Before you troubleshoot, review the general troubleshooting information .
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| C0023-12 Brake Diag Circuit ON Failure |
DTC (Electric servo brake)
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
-4. Wait 1 second or more without pressing the brake pedal
-5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C0023-12 Brake Diag Circuit ON Failure Is DTC C0023-12 indicated?
YES
The failure is duplicated. Go to step 2.
NO
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . 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.
- Brake light relay check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Wait for 3 minutes.
NOTE: Do not close the driver's door.
-3. Check the brake lights without pressing the brake pedal.
Are the brake lights on?
YES
Replace the relay circuit board .
NO
Go to step 3.
- 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 4.
NO
The BRK_LAMP wire is OK. Go to step 5.
- Shorted wire check (BRK_LAMP line) 2
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Electric servo brake control unit 22P 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 electric servo brake control unit and the relay circuit board.
NO
The BRK_LAMP wire is OK. Check for loose terminals and poor connections in the electric servo brake control unit 22P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric servo brake control unit/pedal feel simulator .
- 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 more than 1 minute.
-3. Disconnect the following connectors.
Brake pedal position switch 4P connector PCM connector A (50P) -4. Measure the resistance 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 Is there 1.0 Ω or less?
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.
- PCM check
-1. Substitute a known-good PCM .
-2. Reconnect the following connectors.
PCM connector A (50P) Brake pedal position switch 4P connector -3. Turn the vehicle to the ON mode.
-4. Clear the DTC with the HDS.
-5. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
-6. Wait 1 second or more without pressing the brake pedal.
-7. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C0023-12 Brake Diag Circuit ON Failure Is DTC C0023-12 indicated?
YES
Check for loose terminals and poor connections in the electric servo brake control unit 22P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric servo brake control unit/pedal feel simulator .
NO