NO. 1 ONE OR MORE ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE

BME090369000203

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

1

One or more on-board diagnostic functions inoperative

DESCRIPTION

• Malfunction in hazard warning light system (except vehicle with theft-deterrent system), horn system (Australian specs.), door lock linkage system, or driver's door key cylinder switch system.

POSSIBLE CAUSE

• Malfunction in horn system (Australian specs.)
- Horn circuit malfunction
- Keyless control unit malfunction
- Malfunction in wiring harness between keyless control unit and horn relay
• Malfunction in hazard warning light system (except vehicle with theft-deterrent system)
- Hazard warning light circuit
- Keyless unit malfunction
- Malfunction in the wiring harness between the keyless unit and the flasher unit
• Malfunction in the door lock linkage
• Malfunction in keyless unit door lock/unlock signal circuit
- Keyless unit malfunction
- Malfunction in the wiring harness between the keyless unit and the door lock timer unit

Diagnostic procedure

Note
• For vehicles with theft-deterrent system, follow the procedure from Step 4.

STEP

INSPECTION

ACTION

1

INSPECT HORN AND HAZARD WARNING LIGHT OPERATION DURING ON-BOARD DIAGNOSIS

• Did all of the following items work during on-board diagnostic function operation?
- Hazard lights flashed
Yes
Go to Step 4.
No
Go to the next step.
2

INSPECT HAZARD WARNING LIGHT CIRCUIT

• Do the hazard warning lights flash when the hazard warning switch is on?
Yes
Go to the next step.
No
Inspect hazard warning light circuit.
*3

CHECK TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN KEYLESS UNIT AND FLASHER UNIT) OR KEYLESS UNIT

• Measure the voltage at keyless unit terminal H or short cord terminal D during on-board diagnostic function operation.
- When the hazard warning light flashes: Alternates between B+ and below 1.0 V
• Is the voltage as above?
Yes
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
No
• Inspect the wiring harness between the keyless unit and the flasher unit.
- If the wiring harness is OK, replace the keyless unit and reprogram transmitter ID code, then go to Step 8.
- If there is wiring harness malfunction, repair the wiring harness, then go to Step 8.
4

MAKE SURE THAT ALL DOORS LOCK AND UNLOCK DURING ON-BOARD DIAGNOSIS

• Did all doors unlock and lock during on-board diagnostic function operation?
Yes
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
No
Go to the next step.
5

INSPECT DOOR LOCK LINKAGE

• Operate inner door lock knob and make sure door locks and unlocks manually.
• Does every door lock system work?
Yes
Go to the next step.
No
Inspect the door lock linkage.
*6

CHECK TO SEE WHETHER MALFUNCTION IS IN DOOR LOCK ACTUATOR, DOOR LOCK TIMER UNIT GROUND CIRCUIT OR ELSEWHERE

• Measure the voltage at keyless unit terminal O or short cord terminal F during on-board diagnostic function operation.
- With double locking system or theft-deterrent system
• All door locked: 5→2.5→5 V
• All door unlocked: 5→below 1.0 V→5 V
- Other
• All door locked: B+→6 V→B+
• All door unlocked: B+→below 1.0 V→B+
• Is the voltage as above?
Yes
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
No
• Inspect the door lock timer unit connector.
• Inspect the wiring harness between the keyless unit and the door lock timer unit.
- If above parts are OK, go to the next step.
- If above parts malfunction, repair malfunctioning part.
*7

CHECK TO SEE WHETHER MALFUNCTION IS IN KEYLESS UNIT OR DOOR LOCK TIMER UNIT

• Measure the voltage at door lock timer unit terminal F.
• Is voltage as follows?
- With double locking system or theft-deterrent system: 5 V
- Other: B+
Yes
Replace the keyless unit and reprogram transmitter ID code, then go to the next step.
No
Replace the door lock timer unit, then go to the next step.
8

RECHECK MALFUNCTION SYMPTOM AFTER REPAIR

• Does keyless entry system operate properly?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.