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Home >> Mazda >> 2022 >> MX-5 Miata RF Club >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Electric Supply Unit (ESU) >> DTC B1C79-13: Washer Motor Circuit Malfunction [Electrical Supply Unit (ESU)] >> Diagnostic Procedure

Diagnostic Procedure

DTC B1C79:13 (ELECTRICAL SUPPLY UNIT) DIAGNOSTIC PROCEDURE

Step Inspection Action
1 INSPECT WASHER MOTOR CONNECTOR CONDITION 
  • Switch the ignition off.
  • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  • 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 6.
2 INSPECT WASHER MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the washer motor connector is disconnected.
  • Inspect for continuity between washer motor terminal A (wiring harness-side) and body ground.
  • 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 washer motor terminal A and body ground.
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 Step 6.
3 INSPECT WASHER MOTOR 
 Yes Go to the next step.
No Replace the washer motor, then go to Step 6.
(See WASHER MOTOR REMOVAL/INSTALLATION .)
4 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 6.
5 INSPECT WASHER MOTOR CIRCUIT FOR OPEN CIRCUIT 
  • Verify that the washer motor and electrical supply unit (ESU) connectors are disconnected.
  • Inspect for continuity between washer motor terminal B (wiring harness-side) and electrical supply unit (ESU) terminal 4B (wiring harness-side).
  • 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 washer motor terminal B and electrical supply unit (ESU) terminal 4B.
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.
6 VERIFY THAT REPAIRS HAVE BEEN COMPLETED 
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
7 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.
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