Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Left Rear Wheel Speed Sensor Circuit Short to Battery (C050C12)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Left Rear Wheel Speed Sensor Circuit Short to Battery (C050C12)

DESCRIPTION

Refer to DTC C050C1F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C12

Left Rear Wheel Speed Sensor Circuit Short to Battery

The speed sensor short signal is ON continuously for 0.5 seconds or more.
  • Rear speed sensor LH*1
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)*2
  • Rear skid control sensor wire LH No. 1*2
  • Rear skid control sensor wire LH No. 2*3
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)
  • *1: for AWD
  • *2: for 2WD
  • *3: w/ AVS

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

PROCEDURE

1.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

w/o AVS (for AWD)

A

w/o AVS (for 2WD)

B

w/ AVS (for AWD)

C

w/ AVS (for 2WD)

D
B

GO TO STEP 5

C

GO TO STEP 9

D

GO TO STEP 13

A

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.

*a

Front view of wire harness connector

(to Rear Speed Sensor LH)

(b) Disconnect the T1 rear speed sensor 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

T1-3 (RL+) - T1-1 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SPEED SENSOR LH

NG

3.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Speed Sensor LH)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

T1-1 (RL-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

T1-3 (RL+) or A41-5 (RL+) - T1-1 (RL-) or A41-4 (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.

*a

Front view of rear skid control sensor wire LH No. 1

(to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))

(b) Disconnect the j2 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

j2-2 (RL+) - j2-1 (RL-)

Engine switch on (IG)

11 to 14 V

HINT:

The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

6.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 1)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the Tj2 rear skid control sensor wire LH No. 1 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Tj2-3 (RL+) - Tj2-1 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 1

NG

7.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 1)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

Tj2-1 (RL-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 1 - BRAKE ACTUATOR ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Tj2-3 (RL+) or A41-5 (RL+) - Tj2-1 (RL-) or A41-4 (RL-)

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.

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.

*a

Front view of rear skid control sensor wire LH No. 2

(to Rear Speed Sensor LH)

(b) Disconnect the z23 rear speed sensor 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

z23-1 (RL+) - z23-3 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SPEED SENSOR LH

NG

10.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 2)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the T8 rear skid control sensor wire LH NO. 2 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) - T8-1 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 2

NG

11.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 2)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

T8-1 (RL-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 2 - BRAKE ACTUATOR ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) or A41-5 (RL+) - T8-1 (RL-) or A41-4 (RL-)

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.

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.

*a

Front view of rear skid control sensor wire LH No. 1

(to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))

(b) Disconnect the j2 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

j2-2 (RL+) - j2-1 (RL-)

Engine switch on (IG)

11 to 14 V

HINT:

The rear speed sensor LH is incorporated into the rear axle hub and bearing assembly LH.

If the rear speed sensor LH needs to be replaced, replace the rear axle hub and bearing assembly LH.

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

14.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of rear skid control sensor wire LH No. 2

(to Rear Skid Control Sensor Wire LH No. 1)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the j6 rear skid control sensor wire LH No. 1 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

j6-1 (RL+) - j6-3 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 1

NG

15.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 2)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the T8 rear skid control sensor wire LH No. 2 connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) - T8-1 (RL-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE LH NO. 2

NG

16.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Rear Skid Control Sensor Wire LH No. 2)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

T8-1 (RL-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

17.

CHECK HARNESS AND CONNECTOR (REAR SKID CONTROL SENSOR WIRE LH NO. 2 - BRAKE ACTUATOR ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

T8-3 (RL+) or A41-5 (RL+) - T8-1 (RL-) or A41-4 (RL-)

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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