Lexus ES: Left Rear Wheel Speed Sensor Circuit Short to Battery (C050C12)
DESCRIPTION
Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control.
The speed sensor detects the magnetic fields of the speed sensor rotor as it rotates and outputs a pulse signal.
The frequency of the pulse varies in accordance with the rotational speed of the speed sensor rotor and the system uses this to determine the wheel speed.
HINT:
The following example shows a pulse signal that is output when the wire harness connectors are connected to the speed sensors and skid control ECU (brake actuator assembly).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C050C12 | Left Rear Wheel Speed Sensor Circuit Short to Battery | A short to +B in the speed sensor signal circuit is detected for 0.12 seconds or more. |
|
WIRING DIAGRAM
w/o AVS
w/ AVS 
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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-
After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the b4 rear speed sensor LH (rear axle hub and bearing assembly LH) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| b4-2 (LA+) - b4-1 (LA-) | Engine switch on (IG) | 11 to 14 V |
| Result | Proceed to |
|---|---|
| OK | A |
| NG (w/o AVS) | B |
| NG (w/ AVS) | C |
| A |  | REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH |
| C | | GO TO STEP 5 |
|
| 2. | CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the bN2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN2-1 (RL+) - bN2-2 (RL-) | Engine switch on (IG) | 11 to 14 V |
| OK | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the bN2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN2-2 (RL-) - Body ground | Always | Below 1.5 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the bN2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN2-1 (RL+) or A40-39 (RL+) - bN2-2 (RL-) or A40-23 (RL-) | Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the bn6 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN6-1 (RL+) - bN6-2 (RL-) | Engine switch on (IG) | 11 to 14 V |
| OK | | REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY |
|
| 6. | CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connectors. OK: The connector is securely connected. |
|
(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the bN6 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN6-2 (RL-) - Body ground | Always | Below 1.5 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 7. | CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the bN6 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| bN6-1 (RL+) or A40-39 (RL+) - bN6-2 (RL-) or A40-23 (RL-) | Always | 10 kΩ or higher |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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