Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Right Rear Wheel Speed Sensor Circuit Short to Battery (C051212)

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Right Rear Wheel Speed Sensor Circuit Short to Battery (C051212)

DESCRIPTION

Refer to DTC C05121F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C051212

Right 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 RH*1
  • Rear speed sensor RH (rear axle hub and bearing assembly RH)*2
  • Rear skid control sensor wire RH No. 1*2
  • Rear skid control sensor wire RH 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 RH)

(b) Disconnect the T2 rear speed sensor RH 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

T2-2 (RR+) - T2-1 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SPEED SENSOR RH

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 RH)

(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

T2-1 (RR-) - Body ground

Always

Below 1.5 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T2-2 (RR+) or A41-20 (RR+) - T2-1 (RR-) or A41-19 (RR-)

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 RH No. 1

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

(b) Disconnect the j1 rear speed sensor RH (rear axle hub and bearing assembly RH) 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

j1-2 (RR+) - j1-1 (RR-)

Engine switch on (IG)

11 to 14 V

HINT:

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

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

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

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 RH 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 Tj1 rear skid control sensor wire RH 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

Tj1-2 (RR+) - Tj1-1 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE RH 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 RH 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

Tj1-1 (RR-) - 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 RH 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

Tj1-2 (RR+) or A41-20 (RR+) - Tj1-1 (RR-) or A41-19 (RR-)

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 RH No. 2

(to Rear Speed Sensor RH)

(b) Disconnect the z22 rear speed sensor RH 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

z22-1 (RR+) - z22-3 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SPEED SENSOR RH

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 RH 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 T7 rear skid control sensor wire RH 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

T7-2 (RR+) - T7-1 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE RH 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 RH 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

T7-1 (RR-) - 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 RH 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

T7-2 (RR+) or A41-20 (RR+) - T7-1 (RR-) or A41-19 (RR-)

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 RH No. 1

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

(b) Disconnect the j1 rear speed sensor RH (rear axle hub and bearing assembly RH) 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

j1-2 (RR+) - j1-1 (RR-)

Engine switch on (IG)

11 to 14 V

HINT:

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

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

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH

NG

14.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

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

(to Rear Skid Control Sensor Wire RH 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 j5 rear skid control sensor wire RH 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

j5-1 (RR+) - j5-3 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE RH 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 RH 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 T7 rear skid control sensor wire RH 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

T7-2 (RR+) - T7-1 (RR-)

Engine switch on (IG)

11 to 14 V
OK

REPLACE REAR SKID CONTROL SENSOR WIRE RH 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 RH 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

T7-1 (RR-) - 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 RH 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

T7-2 (RR+) or A41-20 (RR+) - T7-1 (RR-) or A41-19 (RR-)

Always

10 kΩ or higher
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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