WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
HINT:
Even if the electric parking brake is operating normally, the parking brake indicator light (red) on the combination meter may be malfunctioning.
PROCEDURE
1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check if CAN communication system DTCs are output.
Chassis > Brake/EPB > Trouble Codes Result | Proceed to |
---|---|
DTCs are not output | A |
DTCs are output | B |
B | ![]() | GO TO CAN COMMUNICATION SYSTEM |
|
2. | VEHICLE OPERATION CHECK |
(a) When the vehicle's tires are lifted off the ground and the Techstream is used to operate the electric parking brake, check the condition of the rear tires.
Click here
Result | Proceed to |
---|---|
Lock and release operation is normal and parking brake indicator light turns off or blinks (red) | A |
Lock and release operation is malfunctioning and parking brake indicator light illuminates (red) or turns off according to switch operation | B |
Lock and release operation is malfunctioning and parking brake indicator light turns off or blinks (red) | C |
B | ![]() | INSPECT REAR BRAKE |
C | ![]() | GO TO STEP 4 |
|
3. | INSPECT COMBINATION METER ASSEMBLY |
(a) Perform the Active Test of the combination meter assembly using the Techstream.
Body Electrical > Combination Meter > Active Test Tester Display |
---|
Indicat. Park |
(b) Check the combination meter assembly.
OK:
Parking brake indicator light (red) turns on or off in accordance with Techstream operation.
OK | ![]() | REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
NG | ![]() | GO TO METER / GAUGE SYSTEM |
4. | CHECK HARNESS AND CONNECTOR (+BS TERMINAL VOLTAGE) |
(a) Turn the engine switch off.
(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. | CHECK HARNESS AND CONNECTOR (IG1 TERMINAL VOLTAGE) |
(a) Turn the engine switch off.
(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
OK | ![]() | REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Main Body Ecu: Components
COMPONENTS ILLUSTRATION *1 COWL SIDE TRIM BOARD LH *2 FRONT DOOR SCUFF PLATE LH *3 HOOD LOCK CONTROL LEVER SUB-ASSEMBLY *4 INSTRUMENT PANEL GARNISH LH *5 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY WITH MAIN BODY ECU *6 LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Safety Connect System: Microphone Circuit Open (B157213)
DESCRIPTION This DTC is stored when the DCM (telematics transceiver) detects a malfunction in the telephone microphone assembly circuit. DTC No. Detection Item DTC Detection Condition Trouble Area B157213 Microphone Circuit Open Current at terminal MCVD is lower than the malfunction ...