Lexus ES: Left Front Wheel ABS Hold Solenoid Control Circuit Short to Battery (C12A512,...,C12B049)
DESCRIPTION
The ABS solenoid relay and solenoid valves are built into the brake actuator assembly.
The front solenoid valve LH controls the brake fluid pressure of the front wheel cylinder LH of the vehicle.
When this DTC is stored, the fail-safe function operates and the ABS solenoid relay is turned off to prevent the solenoid valves from operating.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C12A512 | Left Front Wheel ABS Hold Solenoid Control Circuit Short to Battery | A short to +B in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12A514 | Left Front Wheel ABS Hold Solenoid Control Circuit Short to Ground or Open | An open or short in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12A51C | Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range |
| Skid control ECU (brake actuator assembly) |
| C12A51E | Left Front Wheel ABS Hold Solenoid Control Circuit Resistance Out of Range | An abnormal resistance in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12A549 | Left Front Wheel ABS Hold Solenoid Control Internal Electronic Failure | An internal malfunction in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12B012 | Left Front Wheel ABS Release Solenoid Control Circuit Short to Battery | A short to +B in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12B014 | Left Front Wheel ABS Release Solenoid Control Circuit Short to Ground or Open | An open or short in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12B01C | Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range |
| Skid control ECU (brake actuator assembly) |
| C12B01E | Left Front Wheel ABS Release Solenoid Control Circuit Resistance Out of Range | An abnormal resistance in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| C12B049 | Left Front Wheel ABS Release Solenoid Control Internal Electronic Failure | An internal malfunction in the solenoid circuit is detected during the self test. | Skid control ECU (brake actuator assembly) |
| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | An open in the solenoid circuit is detected during the self test. | ○ | - |
| A short in the solenoid circuit is detected during the self test. | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C12A51C| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | A current leak in the solenoid circuit is detected during the self test. | ○ | - |
| The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time. | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C12B014| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | An open in the solenoid circuit is detected during the self test. | ○ | - |
| A short in the solenoid circuit is detected during the self test. | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C12B01C| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | A current leak in the solenoid circuit is detected during the self test. | ○ | - |
| The solenoid operation request signal and solenoid operation feedback signal do not match for a certain period of time. | - | ○ | |
| Detection Time | - | - | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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PROCEDURE
| 1. | REPLACE BRAKE ACTUATOR ASSEMBLY |
(a) Replace the skid control ECU (brake actuator assembly).
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| NEXT |  | END |
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General maintenance
Listed below are the general maintenance
items that should be performed
at the intervals specified in
the "Warranty and Service Guide"
or "Owner's Manual Supplement".
It is recommended that any problem
you notice should be brought to
the attention of your Lexus dealer
or qualified service
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