Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Brake System Control Module "A" Internal Electronic Failure (C059749,...,C13C91C)

DESCRIPTION

The solenoid relay and solenoid valves are built into the brake actuator assembly.

The solenoid valves control the brake fluid pressure at each wheel cylinder.

When this DTC is stored, the fail-safe function operates and the solenoid relay is turned off to prevent the solenoid valves from operating.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C059749

Brake System Control Module "A" Internal Electronic Failure

When the +BS terminal voltage is from 9.5 to 17.4 V and the solenoid relay is ON, the relay contact is ON and the pump motor is in a low voltage state continuously for 0.1 seconds or more.

Skid control ECU (Brake actuator assembly)

C12A51C

Left Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFLH) outputs ON, open circuit continues for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12B01C

Left Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

Either of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFLR) outputs OFF, reduction solenoid (SFLR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFLR) outputs ON, reduction solenoid (SFLR) is OFF continuously for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12BB1C

Right Front Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SFRH) outputs ON, open circuit continues for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12C61C

Right Front Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

Either of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFRR) outputs OFF, reduction solenoid (SFRR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SFRR) outputs ON, reduction solenoid (SFRR) is OFF continuously for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12D11C

Left Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRLH) outputs ON, open circuit continues for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12DC1C

Left Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

Either of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRLR) outputs OFF, reduction solenoid (SRLR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRLR) outputs ON, reduction solenoid (SRLR) is OFF continuously for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12E71C

Right Rear Wheel ABS Hold Solenoid Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs OFF, open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs OFF, current is maintained for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs ON, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while holding solenoid (SRRH) outputs ON, open circuit continues for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12F21C

Right Rear Wheel ABS Release Solenoid Control Circuit Voltage Out of Range

Either of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRRR) outputs OFF, reduction solenoid (SRRR) is ON continuously for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while reduction solenoid (SRRR) outputs ON, reduction solenoid (SRRR) is OFF continuously for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C12F662

Left Front Wheel ABS Hold Solenoid / Right Front Wheel ABS Hold Solenoid Signal Compare Failure

A difference in holding solenoid (SFLH) and holding solenoid (SFRH) output accuracy continues for 0.2 seconds or more.

Skid control ECU (Brake actuator assembly)

C12F762

Left Rear Wheel ABS Hold Solenoid / Right Rear Wheel ABS Hold Solenoid Signal Compare Failure

A difference in holding solenoid (SRLH) and holding solenoid (SRRH) output accuracy continues for 0.2 seconds or more.

Skid control ECU (Brake actuator assembly)

C13BF62

Brake Pressure Control Solenoid A/B Signal Compare Failure

A difference in master cylinder cut solenoid (SM1) and master cylinder cut solenoid (SM2) output accuracy continues for 0.2 seconds or more.

Skid control ECU (Brake actuator assembly)

C13C01C

Brake Pressure Control Solenoid "A" Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is on, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is off, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is on, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM1) is off, current continues to be applied for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)

C13C91C

Brake Pressure Control Solenoid "B" Control Circuit Voltage Out of Range

Any of the following is detected:

  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is on, overcurrent continues for 0.1 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is off, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is on, an open circuit continues for 0.05 seconds or more.
  • When the +BS terminal voltage is 17.4 V or less while master cylinder cut solenoid (SM2) is off, current continues to be applied for 0.05 seconds or more.

Skid control ECU (Brake actuator assembly)
DTC Detection Conditions: C12A51C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While holding solenoid (SFLH) outputs OFF, open circuit continues

○

-

-

-

While holding solenoid (SFLH) outputs OFF, current is maintained

-

○

-

-

While holding solenoid (SFLH) outputs ON, overcurrent continues

-

-

○

-

While holding solenoid (SFLH) outputs ON, open circuit continues

-

-

-

○

Detection Time

0.05 seconds or more

0.05 seconds or more

0.1 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

DTC Detection Conditions: C12B01C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

Malfunction Status

While reduction solenoid (SFLR) outputs OFF, reduction solenoid (SFLR) is ON continuously

○

-

While reduction solenoid (SFLR) outputs ON, reduction solenoid (SFLR) is OFF continuously

-

○

Detection Time

0.05 seconds or more

0.05 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: C12BB1C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While holding solenoid (SFRH) outputs OFF, open circuit continues

○

-

-

-

While holding solenoid (SFRH) outputs OFF, current is maintained

-

○

-

-

While holding solenoid (SFRH) outputs ON, overcurrent continues

-

-

○

-

While holding solenoid (SFRH) outputs ON, open circuit continues

-

-

-

○

Detection Time

0.05 seconds or more

0.05 seconds or more

0.1 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

DTC Detection Conditions: C12C61C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

Malfunction Status

While reduction solenoid (SFRR) outputs OFF, reduction solenoid (SFRR) is ON continuously

○

-

While reduction solenoid (SFRR) outputs ON, reduction solenoid (SFRR) is OFF continuously

-

○

Detection Time

0.05 seconds or more

0.05 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: C12D11C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While holding solenoid (SRLH) outputs OFF, open circuit continues

○

-

-

-

While holding solenoid (SRLH) outputs OFF, current is maintained

-

○

-

-

While holding solenoid (SRLH) outputs ON, overcurrent continues

-

-

○

-

While holding solenoid (SRLH) outputs ON, open circuit continues

-

-

-

○

Detection Time

0.05 seconds or more

0.05 seconds or more

0.1 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

DTC Detection Conditions: C12DC1C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

Malfunction Status

While reduction solenoid (SRLR) outputs OFF, reduction solenoid (SRLR) is ON continuously

○

-

While reduction solenoid (SRLR) outputs ON, reduction solenoid (SRLR) is OFF continuously

-

○

Detection Time

0.05 seconds or more

0.05 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: C12E71C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While holding solenoid (SRRH) outputs OFF, open circuit continues

○

-

-

-

While holding solenoid (SRRH) outputs OFF, current is maintained

-

○

-

-

While holding solenoid (SRRH) outputs ON, overcurrent continues

-

-

○

-

While holding solenoid (SRRH) outputs ON, open circuit continues

-

-

-

○

Detection Time

0.05 seconds or more

0.05 seconds or more

0.1 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

DTC Detection Conditions: C12F21C
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

Malfunction Status

While reduction solenoid (SRRR) outputs OFF, reduction solenoid (SRRR) is ON continuously

○

-

While reduction solenoid (SRRR) outputs ON, reduction solenoid (SRRR) is OFF continuously

-

○

Detection Time

0.05 seconds or more

0.05 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: C13C01C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While master cylinder cut solenoid (SM1) is on, overcurrent continues

○

-

-

-

While master cylinder cut solenoid (SM1) is off, an open circuit continues

-

○

-

-

While master cylinder cut solenoid (SM1) is on, an open circuit continues

-

-

○

-

While master cylinder cut solenoid (SM1) is off, current continues

-

-

-

○

Detection Time

0.1 seconds or more

0.05 seconds or more

0.05 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

DTC Detection Conditions: C13C91C
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Diagnosis Condition

When the +BS terminal voltage is 17.4 V or less

○

○

○

○

Malfunction Status

While master cylinder cut solenoid (SM2) is on, overcurrent continues

○

-

-

-

While master cylinder cut solenoid (SM2) is off, an open circuit continues

-

○

-

-

While master cylinder cut solenoid (SM2) is on, an open circuit continues

-

-

○

-

While master cylinder cut solenoid (SM2) is off, current continues

-

-

-

○

Detection Time

0.1 seconds or more

0.05 seconds or more

0.05 seconds or more

0.05 seconds or more

Number of Trips

1 trip

1 trip

1 trip

1 trip

HINT:

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

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

PROCEDURE

1.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

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

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

Chassis > Brake/EPB > Clear DTCs

(d) Press the DTC clear button.

(e) Turn the engine switch off.

NEXT

2.

RECONFIRM DTC

(a) Start the engine.

(b) Perform a road test.

(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 C059749, C12A51C, C12B01C, C12BB1C, C12C61C, C12D11C, C12DC1C, C12E71C, C12F21C, C12F662, C12F762, C13BF62, C13C01C and C13C91C are not output.

A

DTCs C059749, C12A51C, C12B01C, C12BB1C, C12C61C, C12D11C, C12DC1C, C12E71C, C12F21C, C12F662, C12F762, C13BF62, C13C01C and/or C13C91C are output.

B

HINT:

  • If a speed signal of 20 km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly), with the engine switch on (IG) and the stop light switch off, the ECU performs self-diagnosis of the solenoid circuit.
  • 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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