DTC B1026:87 [ADVANCED KEYLESS AND START SYSTEM]

id0902e1387100

Description

• Communication error between keyless control module and steering lock unit

Possible Causes

• Steering lock unit connector or terminals malfunction

• Keyless control module connector or terminals malfunction

• Short to ground in wiring harness between steering lock unit terminal G and keyless control module terminal 2L

• Short to power supply in wiring harness between steering lock unit terminal G and keyless control module terminal 2L

• Open circuit in wiring harness between steering lock unit terminal G and keyless control module terminal 2L

• 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 AND TERMINALS

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the steering lock unit connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 7.

No

Go to the next step.

2

INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS

•  Disconnect the keyless control module connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 7.

No

Go to the next step.

3

INSPECT STEERING LOCK UNIT CIRCUIT FOR SHORT TO GROUND

•  Verify that the steering lock unit and keyless control module connectors are disconnected.

•  Inspect for continuity between steering lock unit terminal G (wiring harness-side) and body ground.

•  Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to ground, then go to Step 7.

No

Go to the next step.

4

INSPECT STEERING LOCK UNIT CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the steering lock unit and keyless control module connectors are disconnected.

•  Reconnect the negative battery cable.

•  Turn the ignition switch to the ON position.

•  Measure the voltage at the steering lock unit terminal G (wiring harness-side).

•  Is there any voltage?

Yes

Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.

No

Go to the next step.

5

INSPECT STEERING LOCK UNIT CIRCUIT FOR OPEN CIRCUIT

•  Verify that the steering lock unit and keyless control module connectors are disconnected.

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Inspect for continuity between the steering lock unit terminal G (wiring harness-side) and keyless control module terminal 2L (wiring harness-side).

•  Is there continuity?

Yes

Go to the next step.

No

Repair or replace the wiring harness for a possible open circuit, then go to Step 7.

6

INSPECT STEERING LOCK UNIT

•  Inspect the steering lock unit.
(See STEERING LOCK UNIT INSPECTION [WITH ADVANCED KEYLESS AND START SYSTEM].)

•  Is there any malfunction?

Yes

Replace the steering lock unit, then go the next step.

(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].)

No

Go to the next step.

7

VERIFY TROUBLESHOOTING COMPLETED

•  Make sure to reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

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

•  Perform the keyless control module DTC inspection using the M-MDS.
(See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the keyless control module.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)

Go to the next step.

No

Go to the next step.

8

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [ADVANCED KEYLESS AND START SYSTEM].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	INSPECT STEERING LOCK UNIT CONNECTOR AND TERMINALS • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the steering lock unit connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
1		No	Go to the next step.
2	INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS • Disconnect the keyless control module connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 7.
2		No	Go to the next step.
3	INSPECT STEERING LOCK UNIT CIRCUIT FOR SHORT TO GROUND • Verify that the steering lock unit and keyless control module connectors are disconnected. • Inspect for continuity between steering lock unit terminal G (wiring harness-side) and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 7.
3		No	Go to the next step.
4	INSPECT STEERING LOCK UNIT CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the steering lock unit and keyless control module connectors are disconnected. • Reconnect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage at the steering lock unit terminal G (wiring harness-side). • Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 7.
4		No	Go to the next step.
5	INSPECT STEERING LOCK UNIT CIRCUIT FOR OPEN CIRCUIT • Verify that the steering lock unit and keyless control module connectors are disconnected. • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Inspect for continuity between the steering lock unit terminal G (wiring harness-side) and keyless control module terminal 2L (wiring harness-side). • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 7.
6	INSPECT STEERING LOCK UNIT • Inspect the steering lock unit. (See STEERING LOCK UNIT INSPECTION [WITH ADVANCED KEYLESS AND START SYSTEM].) • Is there any malfunction?	Yes	Replace the steering lock unit, then go the next step. (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].)
6		No	Go to the next step.
7	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].) • Perform the keyless control module DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].) Go to the next step.
7		No	Go to the next step.
8	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ADVANCED KEYLESS AND START SYSTEM].)
8		No	DTC troubleshooting completed.