Description

Keyless antenna (exterior, rear) circuit malfunction

Detection condition

• Start stop unit detects an open circuit or short to ground in the keyless antenna (exterior, rear) circuit with the ignition switched off.

Fail-safe function

• Inhibits the door lock/unlock control using the advanced keyless entry system.

Possible cause

• Keyless antenna (exterior, rear) connector or terminal malfunction

• LF control unit connector or terminal malfunction

• Short to ground in wiring harness between the following terminals:

• LF control unit terminal AA—Keyless antenna (exterior, rear) terminal B

• LF control unit terminal AB—Keyless antenna (exterior, rear) terminal A

• Open circuit in wiring harness between the following terminals:

• LF control unit terminal AA—Keyless antenna (exterior, rear) terminal B

• LF control unit terminal AB—Keyless antenna (exterior, rear) terminal A

• Keyless antenna (exterior, rear) malfunction

• LF control unit malfunction

• Start stop unit malfunction

Step

Inspection

Action

1

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Disconnect the keyless antenna (exterior, rear) 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 7.

2

• Disconnect the LF control unit 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 7.

3

• Verify that the LF control unit and keyless antenna (exterior, rear) connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side) and body ground:

• Keyless antenna (exterior, rear) terminal B

• Keyless antenna (exterior, rear) terminal A

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• LF control unit terminal AA—Keyless antenna (exterior, rear) terminal B

• LF control unit terminal AB—Keyless antenna (exterior, rear) terminal A

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 a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 7.

No

Go to the next step.

4

• Verify that the LF control unit and keyless antenna (exterior, rear) connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• LF control unit terminal AA—Keyless antenna (exterior, rear) terminal B

• LF control unit terminal AB—Keyless antenna (exterior, rear) terminal A

• 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:

• LF control unit terminal AA—Keyless antenna (exterior, rear) terminal B

• LF control unit terminal AB—Keyless antenna (exterior, rear) terminal A

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 7.

5

• Always reconnect all disconnected connectors.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Clear the DTC for the advanced keyless entry system using the M-MDS.

  (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].)

• Perform the following work:

• Switch the ignition off.

• Open the front door (LH).

• Close all the doors and trunk.

• Retrieve the advanced keyless entry system DTCs using the M-MDS.

  (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].)

• Is the same DTC displayed?

Yes

Replace the keyless antenna (exterior, rear), then go to the next step.

(See KEYLESS ANTENNA REMOVAL/INSTALLATION.)

No

Go to Step 8.

6

• Clear the DTC for the advanced keyless entry system using the M-MDS.

  (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].)

• Perform the following work:

• Switch the ignition off.

• Open the front door (LH).

• Close all the doors and trunk.

• Retrieve the advanced keyless entry system DTCs using the M-MDS.

  (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].)

• Is the same DTC displayed?

Yes

Replace the LF control unit, then go to the next step.

(See LF CONTROL UNIT REMOVAL/INSTALLATION.)

No

Go to Step 8.

7

• Always reconnect all disconnected connectors.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Clear the DTC for the advanced keyless entry system using the M-MDS.

  (See CLEARING DTC [ADVANCED KEYLESS ENTRY SYSTEM].)

• Perform the following work:

• Switch the ignition off.

• Open the front door (LH).

• Close all the doors and trunk.

• Retrieve the advanced keyless entry system DTCs using the M-MDS.

  (See DTC INSPECTION [ADVANCED KEYLESS ENTRY SYSTEM].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the start stop unit.

  (See START STOP UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

8

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [ADVANCED KEYLESS ENTRY SYSTEM].)

No

DTC troubleshooting completed.