Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: ABS Pump Motor Control Circuit Open (C052C13,C052C49,C052F14)

DESCRIPTION

The motor relay and motor fail safe relay are built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operate ABS, TRAC, VSC, brake hold or brake assist, the motor relay turns ON and drives the motor pump built into the brake actuator assembly.

If any DTCs related to motor supply power are stored, fail-safe is performed and supply of power to the motor relay is cut by the motor fail safe relay.

If the voltage supplied to the motor relay (BM) is below the DTC detection threshold due to low voltage from the battery or alternator, these DTCs may be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C052C13

ABS Pump Motor Control Circuit Open

Either of the following is detected:

  • When the +BS terminal voltage is from 9.5 to 17.4 V with the motor relay ON while control operates, a relay contact OFF condition continues for 0.12 seconds or more.
  • When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay supervision voltage malfunction continues for 0.12 seconds or more when the motor relay turns ON during control operation.
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)

C052C49

ABS Pump Motor Control Internal Electronic Failure

Any of the following is detected:

  • When the +BS terminal voltage is from 9.5 to 17.4 V, overcurrent in the motor relay and motor fail-safe relay continues for 0.05 seconds or more.
  • Motor relay overcurrent continues for 0.05 seconds or more.
  • When the +BS terminal voltage is from 9.5 to 17.4 V, a motor relay gate voltage malfunction continues for 0.12 seconds or more.
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)

C052F14

ABS Pump Motor Supply Voltage Circuit Short to Ground or Open

When voltage at +BS terminal is 9.5 V or higher, open in BM terminal continues for 1 second or more.

  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)
DTC Detection Conditions: C052C13
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is from 9.5 to 17.4 V

Malfunction Status

Motor relay ON while control operates, relay contact OFF condition continues

-

Motor relay supervision voltage malfunction continues, motor relay turns ON during control operation

-

Detection Time

0.12 seconds or more

0.12 seconds or more

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: C052C49
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

When the +BS terminal voltage is from 9.5 to 17.4 V

-

Malfunction Status

Overcurrent in motor relay and motor fail-safe relay continues

-

-

Motor relay overcurrent continues

-

-

Motor relay gate voltage malfunction continues

-

-

Detection Time

0.05 seconds or more

0.05 seconds or more

0.12 seconds or more

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for any of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (BM TERMINAL)

(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 Skid Control ECU (Brake Actuator Assembly))

(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A41-46 (BM) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A41-30 (GND2) - Body ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CLEAR DTC

(a) Reconnect the A41 skid control ECU (brake actuator assembly) connector.

(b) Connect the Techstream to the DLC3.

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

(d) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Clear DTCs

(e) Press the DTC clear button.

(f) Turn the engine switch off.

NEXT

4.

RECONFIRM DTC

(a) Start the engine.

(b) Drive the vehicle at a speed of 20 km/h (12 mph).

(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.

Chassis > Brake/EPB > Trouble Codes

(d) Check if the same DTC is output.

Result

Proceed to

DTCs C052C13, C052C49 and C052F14 are not output.

A

DTCs C052C13, C052C49 and/or C052F14 are output.

B

HINT:

  • If a speed signal of 20 km/h (12 mph) or more is sent to the skid control ECU (brake actuator assembly) with the engine switch on (IG) and the stop light switch assembly off, the ECU performs self diagnosis of the motor and solenoid circuits.
  • If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
  • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
  • If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

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