DTC U0028:81/U0028:83/U0028:87 [BCM]

id0902f5341100

Malfunction Location

Vehicles with advanced keyless and start system

• DTC U0028:81: Communication error with keyless control module

• DTC U0028:83: Error signal from keyless control module

• DTC U0028:87: No response from keyless control module

Vehicles with keyless entry system

• DTC U0028:81: Communication error with keyless receiver

• DTC U0028:83: Error signal from keyless receiver

• DTC U0028:87: No response from keyless receiver

Detection Condition

Vehicles with advanced keyless and start system

• Communication error between keyless control module and BCM

Vehicles with keyless entry system

• Communication error between keyless receiver and BCM

Possible Causes

Vehicles with advanced keyless and start system

• Keyless control module connector or terminals malfunction

• BCM connector or terminals malfunction

• Short to ground in wiring harness between keyless control module terminal 2F and BCM terminal 6W

• Short to power supply in wiring harness between keyless control module terminal 2F and BCM terminal 6W

• Open circuit in wiring harness between keyless control module terminal 2F and BCM terminal 6W

• Keyless control module malfunction

• BCM malfunction

Vehicles with keyless entry system

• Keyless receiver connector or terminals malfunction

• Keyless receiver malfunction

• BCM connector or terminals malfunction

• Short to ground in wiring harness between keyless receiver (4-pin connector type) terminal C and BCM terminal 6W

• Short to ground in wiring harness between keyless receiver (6-pin connector type) terminal D and BCM terminal 6W

• Short to power supply in wiring harness between keyless receiver (4-pin connector type) terminal C and BCM terminal 6W

• Short to power supply in wiring harness between keyless receiver (6-pin connector type) terminal D and BCM terminal 6W

• Open circuit in wiring harness between keyless receiver (4-pin connector type) terminal C and BCM terminal 6W

• Open circuit in wiring harness between keyless receiver (6-pin connector type) terminal D and BCM terminal 6W

• BCM malfunction

System Wiring Diagram

am2zzw00005051

Diagnostic Procedure

Vehicles with advanced keyless and start system

Step

Inspection

Action

1

PERFORM DTC INSPECTION

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

•  Lock and unlock the doors using the transmitter.

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

•  Is the DTC U0028:81, U0028:83, or U0028:87 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

VERIFY KEYLESS CONTROL MODULE CONNECTOR CONDITION

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the keyless control module 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 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.

4

VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR SHORT TO GROUND

•  Keyless control module and BCM connectors are disconnected.

•  Inspect for continuity between BCM terminal 6W (wiring harness-side) 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.

5

VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR SHORT TO POWER SUPPLY

•  Keyless control module and BCM connectors are disconnected.

•  Reconnect the negative battery cable.

•  Measure the voltage at the BCM terminal 6W (wiring harness-side).

•  Is there any voltage?

Yes

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

No

Go to the next step.

6

VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR OPEN CIRCUIT

•  Keyless control module and BCM connectors are disconnected.

•  Disconnect the negative battery cable.

•  Inspect for continuity between keyless control module terminal 2F (wiring harness-side) and BCM terminal 6W (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

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

7

VERIFY KEYLESS CONTROL MODULE CONDITION

•  Inspect the keyless control module.
(See KEYLESS CONTROL MODULE INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  Is the keyless control module normal?

Yes

Go to the next step.

No

Replace the keyless control module, then go to the final step.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)

8

VERIFY TROUBLESHOOTING COMPLETED

•  Reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

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

•  Lock and unlock the doors using the transmitter.

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

•  Is the DTC U0028:81, U0028:83, or U0028:87 displayed?

Yes

Replace the BCM.

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

No

DTC troubleshooting completed.

Step	Inspection	Action
1	PERFORM DTC INSPECTION • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Lock and unlock the doors using the transmitter. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the DTC U0028:81, U0028:83, or U0028:87 displayed?	Yes	Go to the next step.
No	DTC troubleshooting completed.
2	VERIFY KEYLESS CONTROL MODULE CONNECTOR CONDITION • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the keyless control module 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 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.
4	VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR SHORT TO GROUND • Keyless control module and BCM connectors are disconnected. • Inspect for continuity between BCM terminal 6W (wiring harness-side) 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.
5	VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR SHORT TO POWER SUPPLY • Keyless control module and BCM connectors are disconnected. • Reconnect the negative battery cable. • Measure the voltage at the BCM terminal 6W (wiring harness-side). • Is there any voltage?	Yes	Repair or replace the related wiring harness, then go to the final step.
No	Go to the next step.
6	VERIFY WIRING HARNESS BETWEEN KEYLESS CONTROL MODULE AND BCM FOR OPEN CIRCUIT • Keyless control module and BCM connectors are disconnected. • Disconnect the negative battery cable. • Inspect for continuity between keyless control module terminal 2F (wiring harness-side) and BCM terminal 6W (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
No	Repair or replace the related wiring harness, then go to the final step.
7	VERIFY KEYLESS CONTROL MODULE CONDITION • Inspect the keyless control module. (See KEYLESS CONTROL MODULE INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • Is the keyless control module normal?	Yes	Go to the next step.
No	Replace the keyless control module, then go to the final step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)
8	VERIFY TROUBLESHOOTING COMPLETED • Reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Lock and unlock the doors using the transmitter. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the DTC U0028:81, U0028:83, or U0028:87 displayed?	Yes	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
No	DTC troubleshooting completed.

Vehicles with keyless entry system

Step

Inspection

Action

1

PERFORM DTC INSPECTION

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

•  Lock and unlock the doors using the transmitter.

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

•  Is the DTC U0028:81, U0028:83, or U0028:87 displayed?

Yes

Go to the next step.

No

DTC troubleshooting completed.

2

VERIFY KEYLESS RECEIVER CONNECTOR CONDITION

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the keyless receiver 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 KEYLESS RECEIVER CONDITION

•  Inspect the keyless receiver.
(See KEYLESS RECEIVER INSPECTION [KEYLESS ENTRY SYSTEM].)

•  Is the keyless receiver normal?

Yes

Go to the next step.

No

Replace the keyless receiver, then go to the final step.

(See KEYLESS RECEIVER REMOVAL/INSTALLATION [KEYLESS ENTRY SYSTEM].)

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 KEYLESS RECEIVER AND BCM FOR SHORT TO GROUND

•  Keyless receiver and BCM connectors are disconnected.

•  Inspect for continuity between BCM terminal 6W (wiring harness-side) 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 WIRING HARNESS BETWEEN KEYLESS RECEIVER AND BCM FOR SHORT TO POWER SUPPLY

•  Keyless receiver and BCM connectors are disconnected.

•  Reconnect the negative battery cable.

•  Measure the voltage at the BCM terminal 6W (wiring harness-side).

•  Is there any voltage?

Yes

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

No

Go to the next step.

7

VERIFY BETWEEN KEYLESS RECEIVER AND BCM FOR OPEN CIRCUIT

•  Keyless receiver and BCM connectors are disconnected.

•  Disconnect the negative battery cable.

•  Inspect for continuity between keyless receiver (4-pin connector type) terminal C (wiring harness-side)/keyless receiver (6-pin connector type) terminal D (wiring harness-side) and BCM terminal 6W (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

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

8

VERIFY TROUBLESHOOTING COMPLETED

•  Reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

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

•  Lock and unlock the doors using the transmitter.

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

•  Is the DTC U0028:81, U0028:83, or U0028:87 displayed?

Yes

Replace the BCM.

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

No

DTC troubleshooting completed.