Lexus ES: Brake System Control Module "A" System Voltage System Voltage High (C137BA3)
DESCRIPTION
If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.
This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the battery or alternator circuit, etc.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C137BA3 | Brake System Control Module "A" System Voltage System Voltage High | +BS terminal voltage is more than 16.5 V for 1 second or more. |
|
WIRING DIAGRAM
Refer to DTC C137BA2.
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CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
| (a) Make sure that there is no looseness at the locking part and the connecting part of the connector. OK: The connector is securely connected. |
|
(b) Disconnect the A40 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 |
|---|---|---|
| A40-30 (+BS) - Body ground | Always | 11 to 14 V |
| OK |  | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Inspection
INSPECTION PROCEDURE 1. INSPECT POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR DRIVER DOOR) (a) Connect a positive (+) lead from the auxiliary battery to connector terminal 2. NOTICE: Do not connect a positive (+) lead from the auxiliary battery to any terminal other than terminal 2 to avoid damaging
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Before performing troubleshooting for the front radar sensor system, perform troubleshooting for the pre-collision system.
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*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. PRE-CHECK (a) Measu
