DTC B1013:23 [BCM]

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Malfunction Location

• Rear window defroster switch circuit malfunction

Detection Condition

• Rear window defroster switch is in a pressed condition for 2 min or more (rear window defroster switch stuck)

Possible Causes

• Connection malfunction with connector

• Short to ground in the wiring harness between climate control unit terminal V and BCM terminal 6D (vehicles with full-auto air conditioner)

• Short to ground in wiring harness between climate control unit terminal I and BCM terminal 6D (vehicles with manual air conditioner)

• Climate control unit malfunction

• BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

PERFORM DTC INSPECTION

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the rear window defroster switch on.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is DTC B1013:23 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION

•  Disconnect the negative battery cable.

•  Disconnect the climate control unit connector.

•  Inspect the connection condition and wiring harness.

•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?

Yes

Go to the next step.

No

Repair or replace the connector, then go to the final step.

3

VERIFY CLIMATE CONTROL UNIT CONDITION

•  Remove the climate control unit.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

•  Inspect the climate control unit.
(See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].)

•  Is the climate control unit normal?

Yes

Go to the next step.

No

Replace the climate control unit, then go to the final step.

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

4

VERIFY BCM CONNECTOR CONDITION

•  Disconnect the BCM connector.

•  Inspect the connection condition and wiring harness.

•  Are the connector terminals normal without damage, deformation, corrosion, or disconnection?

Yes

Go to the next step.

No

Repair or replace the connector, then go to the final step.

5

VERIFY WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND BCM FOR SHORT TO GROUND

•  Inspect for continuity between BCM terminal 6D and body ground.

•  Is there continuity?

Yes

Repair or replace the related wiring harness, then go to the final step.

No

Go to the next step.

6

VERIFY TROUBLESHOOTING COMPLETED

•  Connect all the connectors.

•  Connect the battery cable.

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the rear window defroster switch on.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is DTC B1013:23 displayed?

Yes

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	PERFORM DTC INSPECTION • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the rear window defroster switch on. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is DTC B1013:23 displayed?	Yes	Go to the next step.
1		No	DTC troubleshooting completed.
2	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION • Disconnect the negative battery cable. • Disconnect the climate control unit connector. • Inspect the connection condition and wiring harness. • Are the connector terminals normal without damage, deformation, corrosion, or disconnection?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to the final step.
3	VERIFY CLIMATE CONTROL UNIT CONDITION • Remove the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) • Inspect the climate control unit. (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].) (See CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER].) • Is the climate control unit normal?	Yes	Go to the next step.
3		No	Replace the climate control unit, then go to the final step. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
4	VERIFY BCM CONNECTOR CONDITION • Disconnect the BCM connector. • Inspect the connection condition and wiring harness. • Are the connector terminals normal without damage, deformation, corrosion, or disconnection?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to the final step.
5	VERIFY WIRING HARNESS BETWEEN CLIMATE CONTROL UNIT AND BCM FOR SHORT TO GROUND • Inspect for continuity between BCM terminal 6D and body ground. • Is there continuity?	Yes	Repair or replace the related wiring harness, then go to the final step.
5		No	Go to the next step.
6	VERIFY TROUBLESHOOTING COMPLETED • Connect all the connectors. • Connect the battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the rear window defroster switch on. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is DTC B1013:23 displayed?	Yes	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
6		No	DTC troubleshooting completed.