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 (VSA)
- 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 2 seconds 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.
- Relay circuit board 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 .
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
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.
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 ground in the wire between the relay circuit board and the VSA modulator-control unit.
NO
The BRK LAMP wire is OK. 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 .
- 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.
PCM connector A (50P) (L15BE engine) PCM connector A (51P) (K24W9/K24V9 engine) Brake pedal position switch 4P connector -4. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode PCM connector A (50P) (L15BE engine): disconnected PCM connector A (51P) (K24W9/K24V9 engine): disconnected Brake pedal position switch 4P connector: disconnected Test point 1 PCM connector A (50P) (L15BE engine) No. 26 PCM connector A (51P) (K24W9/K24V9 engine) No. 37 Test point 2 Brake pedal position switch 4P connector (female terminals) No. 1: 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.
- PCM check
-1. Reconnect the following connectors.
PCM connector A (50P) (L15BE engine) PCM connector A (51P) (K24W9/K24V9 engine) Brake pedal position switch 4P connector -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. Wait 2 seconds or more without pressing the brake pedal.
-6. 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 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