DTC B1C79:13 [ELECTRICAL SUPPLY UNIT (ESU)]

id0902ff062000

Description

Washer motor circuit malfunction
Detection condition
•  Electrical supply unit (ESU) detects an open circuit in the washer motor circuit with the ignition switched ON (engine off or on).
Fail-safe
Not applicable
Possible cause
•  Washer motor connector or terminal malfunction
•  Washer motor malfunction
•  Electrical supply unit (ESU) connector or terminal malfunction
•  Open circuit in wiring harness between the following terminals:
―  Washer motor terminal B—Electrical supply unit (ESU) terminal 4B
―  Washer motor terminal A—Electrical supply unit (ESU) terminal 4H
•  Electrical supply unit (ESU) malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT WASHER MOTOR CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery cable.
•  Disconnect the washer motor connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 5.
2
INSPECT WASHER MOTOR
•  Inspect the washer motor.
•  Is the washer motor normal?
Yes
Go to the next step.
No
Replace the washer motor, then go to Step 5.
(See WASHER MOTOR REMOVAL/INSTALLATION.)
3
INSPECT ELECTRICAL SUPPLY UNIT (ESU) CONNECTOR CONDITION
•  Disconnect the electrical supply unit (ESU) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 5.
4
INSPECT WASHER MOTOR CIRCUIT FOR OPEN CIRCUIT
•  Verify that the washer motor and electrical supply unit (ESU) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Washer motor terminal B—Electrical supply unit (ESU) terminal 4B
―  Washer motor terminal A—Electrical supply unit (ESU) terminal 4H
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Washer motor terminal B—Electrical supply unit (ESU) terminal 4B
•  Washer motor terminal A—Electrical supply unit (ESU) terminal 4H
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to the next step.
5
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Clear the DTC for the electrical supply unit (ESU) using the M-MDS.
•  Operate the windshield washer switch to ON position.
•  Retrieve the electrical supply unit (ESU) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the electrical supply unit (ESU).
Go to the next step.
No
Go to the next step.
6
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [ELECTRICAL SUPPLY UNIT (ESU)].)
No
DTC troubleshooting completed.