No.1 SECURITY LIGHT DOES NOT OPERATE CORRECTLY[IMMOBILIZER SYSTEM (PATS) (L3)]

id0903f6814000

Possible Cause

• PCM malfunction

• Instrument cluster malfunction

• Open or short circuit in wiring harness between instrument cluster and PCM

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

INSPECT CIRCUITS IN OTHER WARNING LIGHTS OR INDICATOR LIGHTS IN INSTRUMENT CLUSTER

•  Turn the ignition switch to the ON position.

•  Do other warning lights in the instrument cluster illuminate normally?

Yes

Go to the next step.

No

Inspect the instrument cluster.

2

INSPECT INSTRUMENT CLUSTER POWER SUPPLY SYSTEM

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the instrument cluster connector (16-pin).

•  Connect the negative battery cable.

•  Does the security light illuminate?

Yes

Replace the instrument cluster.

No

Go to the next step.

3

INSPECT INSTRUMENT CLUSTER GROUND

•  Disconnect the negative battery cable.

•  Connect a jumper wire between instrument cluster terminal 1F and ground.

•  Connect the instrument cluster connector (16-pin).

•  Connect the negative battery cable.

•  Does the security light illuminate?

Yes

Go to the next step.

No

Replace the instrument cluster.

4

INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND PCM

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the instrument cluster connector. (16-pin)

•  Inspect the wiring harness between instrument cluster connector terminal 1F and PCM connector terminal 13 for the following items.

―  Short to ground

―  Short to B+

―  Open circuit

•  Is the wiring harness normal?

Yes

Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM.

(See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)

No

After repairing the wiring harness, go to the next step.

5

VERIFY THAT THE MALFUNCTION DOES NOT RECUR

•  Turn the ignition switch to the LOCK position.

•  Connect the instrument cluster connector.

•  Connect the negative battery cable.

•  Turn the ignition switch to the ON position.

•  Does the security light illuminate?

Yes

Troubleshooting completed.

No

If the malfunction recurs after the inspection, go to Step 1.

STEP	INSPECTION		ACTION
1	INSPECT CIRCUITS IN OTHER WARNING LIGHTS OR INDICATOR LIGHTS IN INSTRUMENT CLUSTER • Turn the ignition switch to the ON position. • Do other warning lights in the instrument cluster illuminate normally?	Yes	Go to the next step.
1		No	Inspect the instrument cluster.
2	INSPECT INSTRUMENT CLUSTER POWER SUPPLY SYSTEM • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the instrument cluster connector (16-pin). • Connect the negative battery cable. • Does the security light illuminate?	Yes	Replace the instrument cluster.
2		No	Go to the next step.
3	INSPECT INSTRUMENT CLUSTER GROUND • Disconnect the negative battery cable. • Connect a jumper wire between instrument cluster terminal 1F and ground. • Connect the instrument cluster connector (16-pin). • Connect the negative battery cable. • Does the security light illuminate?	Yes	Go to the next step.
3		No	Replace the instrument cluster.
4	INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND PCM • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the instrument cluster connector. (16-pin) • Inspect the wiring harness between instrument cluster connector terminal 1F and PCM connector terminal 13 for the following items. ― Short to ground ― Short to B+ ― Open circuit • Is the wiring harness normal?	Yes	Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM. (See IMMOBILIZER SYSTEM (PATS) KEY ADDITION/CLEARING[L3].)
4		No	After repairing the wiring harness, go to the next step.
5	VERIFY THAT THE MALFUNCTION DOES NOT RECUR • Turn the ignition switch to the LOCK position. • Connect the instrument cluster connector. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Does the security light illuminate?	Yes	Troubleshooting completed.
5		No	If the malfunction recurs after the inspection, go to Step 1.