DTC B108A:29 [ADVANCED KEYLESS AND START SYSTEM]

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Detection Condition

• Push switch off signal detected while ignition switch is at ON

Possible Causes

• Steering lock unit connector or terminals malfunction

• Keyless control module connector or terminals malfunction

• Open or short circuit in wiring harness between steering lock unit and keyless control module

• Steering lock unit malfunction

• Keyless control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

INSPECT STEERING LOCK UNIT CONNECTOR

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the steering lock unit connector.

•  Inspect the steering lock unit connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the steering lock unit connector or terminal, then go to Step 5.

2

INSPECT KEYLESS CONTROL MODULE CONNECTOR

•  Disconnect the keyless control module connector.

•  Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the keyless control module connector or terminal, then go to Step 5.

3

INSPECT WIRING HARNESS BETWEEN STEERING LOCK UNIT AND KEYLESS CONTROL MODULE

•  Inspect the wiring harness between keyless control module terminal 3V and steering lock unit terminal A for the following:

―  Short to ground

―  Short to power supply

―  Open circuit

•  Is the wiring harness normal?

Yes

Go to the next step.

No

Repair or replace the wiring harness between steering lock unit and keyless control module, then go to Step 5.

4

STEERING LOCK UNIT INSPECTION

•  Reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Turn the ignition switch to the ON position.

•  Inspect the voltage of steering lock unit terminals A, B, E, and H.
(See STEERING LOCK UNIT INSPECTION [WITH ADVANCED KEYLESS AND START SYSTEM].)

•  Is the voltage normal?

Yes

Go to the next step.

No

Replace the steering lock unit and perform steering lock unit programming.

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [L.H.D.].)

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [R.H.D.].)

(See STEERING LOCK UNIT ID CODE REGISTRATION [ADVANCED KEYLESS AND START SYSTEM].)

Go to the next step.

5

VERIFY DTCs

•  Reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].)

•  Verify the DTCs using the M-MDS.
(See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  Is the DTC B108A:29 displayed?

Yes

Replace the keyless control module.

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

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT STEERING LOCK UNIT CONNECTOR • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the steering lock unit connector. • Inspect the steering lock unit connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
1		No	Repair/replace the steering lock unit connector or terminal, then go to Step 5.
2	INSPECT KEYLESS CONTROL MODULE CONNECTOR • Disconnect the keyless control module connector. • Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
2		No	Repair/replace the keyless control module connector or terminal, then go to Step 5.
3	INSPECT WIRING HARNESS BETWEEN STEERING LOCK UNIT AND KEYLESS CONTROL MODULE • Inspect the wiring harness between keyless control module terminal 3V and steering lock unit terminal A for the following: ― Short to ground ― Short to power supply ― Open circuit • Is the wiring harness normal?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness between steering lock unit and keyless control module, then go to Step 5.
4	STEERING LOCK UNIT INSPECTION • Reconnect all disconnected connectors. • Reconnect the negative battery cable. • Turn the ignition switch to the ON position. • Inspect the voltage of steering lock unit terminals A, B, E, and H. (See STEERING LOCK UNIT INSPECTION [WITH ADVANCED KEYLESS AND START SYSTEM].) • Is the voltage normal?	Yes	Go to the next step.
4		No	Replace the steering lock unit and perform steering lock unit programming. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [L.H.D.].) (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [R.H.D.].) (See STEERING LOCK UNIT ID CODE REGISTRATION [ADVANCED KEYLESS AND START SYSTEM].) Go to the next step.
5	VERIFY DTCs • Reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].) • Verify the DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • Is the DTC B108A:29 displayed?	Yes	Replace the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)
5		No	DTC troubleshooting completed.