NO.1 ONE OR MORE ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]

id0903d2800600

1 | One or more on-board diagnostic functions inoperative
DESCRIPTION | • Malfunction in trunk lid opener system, horn system, hazard warning light system, or door lock linkage system
POSSIBLE CAUSE | • Malfunction in trunk lid opener system ― Trunk lid opener relay circuit malfunction ― Keyless control module malfunction • Malfunction in horn system ― Horn circuit malfunction ― Keyless control module malfunction ― Malfunction in wiring harness between keyless control module and horn relay • Malfunction in hazard warning light system ― Hazard warning light circuit ― Keyless control module malfunction ― Malfunction in wiring harness between keyless control module and hazard warning lights ― Malfunction in wiring harness between keyless control module and flasher control module • Malfunction in door lock linkage • Malfunction in keyless control module door lock/unlock signal circuit ― Keyless control module malfunction

• When performing an asterisked (*) troubleshooting inspection, slightly 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, verify that the connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT HORN AND HAZARD WARNING LIGHT OPERATION DURING ON-BOARD DIAGNOSIS • Do all of the following items work during on-board diagnostic function operation? ― Hazard warning lights flash. ― Horns sounds intermittently. ― Trunk lid opens. | Yes | Go to Step 11.
No | Go to the next step.
2 | INSPECT HAZARD WARNING LIGHT OPERATION DURING ON-BOARD DIAGNOSIS • Do the hazard warning lights flash during on-board diagnostic function operation? | Yes | Go to Step 5.
No | Go to the next step.
3 | INSPECT HAZARD WARNING LIGHT CIRCUIT • Do the hazard warning lights flash when hazard warning switch is on? | Yes | Go to the next step.
No | Inspect the hazard warning light circuit.
*4 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN KEYLESS CONTROL MODULE AND FLASHER CONTROL MODULE) OR KEYLESS CONTROL MODULE • Measure the voltage at keyless control module connector terminal 4N during on-board diagnostic function operation. ― When hazard warning lights flashed: Alternates between B+ and below 1.0 V • Is the voltage as above? | Yes | Reinspect the malfunction symptoms, then repeat from Step 1 if malfunction recurs.
No | • Inspect the wiring harness between the keyless control module and flasher control module. ― If the wiring harness is normal, replace the keyless control module and reprogram the transmitter ID code, then go to Step 14. ― If the wiring harness is malfunctioning, repair the wiring harness, then go to Step 14.
5 | INSPECT HORN OPERATION DURING ON-BOARD DIAGNOSIS • Dose horn sound intermittently during on-board diagnostic function operation? | Yes | Go to Step 8.
No | Go to the next step.
6 | INSPECT HORN CIRCUIT • Does horn sound when the horn switch on the vehicle is pressed? | Yes | Go to the next step.
No | Inspect the horn circuit.
*7 | INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS CONTROL MODULE AND HORN RELAY) OR KEYLESS CONTROL MODULE • Turn the ignition switch to the LOCK position. • Disconnect the keyless control module connector and horn relay connector. • Is there continuity between keyless control module connector terminal 3R and horn relay connector? | Yes | Replace the keyless control module and reprogram the keyless control module ID code, then go to Step 14.
No | Repair the wiring harness between the keyless control module and horn relay, then go to Step 14.
8 | CHECK TRUNK LID OPERATION DURING ON-BOARD DIAGNOSIS • Does the trunk lid open during on-board diagnostic function operation? | Yes | Go to Step 11.
No | Go to the next step.
9 | INSPECT TRUNK LID OPENER SYSTEM • Does the trunk lid open by the trunk lid opener switch? | Yes | Go to the next step.
No | Inspect the trunk lid opener system.
*10 | INSPECT IF MALFUNCTION IS IN TRUNK LID OPENER RELAY CIRCUIT OR KEYLESS CONTROL MODULE • Disconnect the keyless control module connector. • Measure the voltage at keyless control module connector terminal 4O. • Is the voltage approx. 12 V? | Yes | Replace the keyless control module and the reprogram transmitter ID code, then go to Step 14.
No | Inspect the trunk lid opener relay circuit.
11 | VERIFY THAT ALL DOORS LOCK AND UNLOCK DURING ON-BOARD DIAGNOSIS • Do all doors unlock and lock during on-board diagnostic function operation? | Yes | Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
No | Go to the next step.
12 | INSPECT DOOR LOCK LINKAGE • Operate the door lock knob and verify the door locks and unlocks manually. • Does every door lock system work? | Yes | Go to the next step.
No | Inspect the door lock linkage.
*13 | INSPECT IF MALFUNCTION IS IN DOOR LOCK ACTUATOR, KEYLESS CONTROL MODULE GROUND CIRCUIT OR ELSEWHERE • Measure the voltage at keyless control module connector terminals 1C and 1A. ― All doors locked: Cycles 1.0 V or less →B+→1.0 V or less (terminal 1A) ― All doors unlocked: Cycles B+→1.0 V or less→B+ (terminal 1C) • Is the voltage as above? | Yes | Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
No | • Inspect the keyless control module the connector. • Inspect the wiring harness between the keyless control module and door lock actuator. ― If the above parts are normal, go to the next step. ― If any of above parts are malfunctioning, repair the malfunctioning part.
14 | REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR • Does the keyless entry system operate properly? | Yes | Troubleshooting completed. Explain repairs to customer.
No | Reinspect the malfunction symptoms, then repeat from Step 1 if malfunction recurs.