NO.1 ONE OR MORE ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]SM2446079
NO.1 ONE OR MORE ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]

id0903d2800600

• 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.

1
One or more on-board diagnostic functions inoperative
DESCRIPTION
• Malfunction in door lock linkage system
POSSIBLE CAUSE
• Malfunction in door lock linkage
• Malfunction in BCM door lock/unlock signal circuit
― BCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
CHECK HORN, AND HAZARD WARNING LIGHT OPERATION DURING ON-BOARD DIAGNOSIS
• Did all of the following items work during on-board diagnostic function operation?
― Hazard warning lights flashed
― Horns sounded intermittently
Yes
Go to Step 5.
No
Go to next step.
2
INSPECT HAZARD WARNING LIGHT OPERATION DURING ON-BOARD DIAGNOSIS
• Did hazard warning lights flash during on-board diagnostic function operation?
Yes
Go to Step 5.
No
Go to next step.
3
INSPECT HAZARD WARNING LIGHT CIRCUIT
• Do hazard warning lights flash when hazard warning switch is on?
Yes
Go to next step.
No
Inspect hazard switch and related circuit, then go to the next step.
*4
INSPECT IF MALFUNCTION IS IN WIRING HARNESS (BETWEEN BCM AND TURN LIGHTS) OR BCM
• Measure the voltage at BCM terminals 1K and 1M (16-pin connector), and 5O and 5R (30-pin connector) during on-board diagnostic function operation.
― When hazard warning light flashed: Alternates between B+ and below 1.0 V
• Are the voltage as above?
Yes
Recheck malfunction symptoms, then repeat from Step 1 if malfunction reoccurs.
No
• Inspect wiring harness between BCM and turn lights.
― If wiring harness is normal, replace the BCM, then go to Step 8.
― If wiring harness malfunction, repair wiring harness, then go to Step 8.
5
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.
6
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.
*7
INSPECT IF MALFUNCTION IS IN DOOR LOCK ACTUATOR, BCM GROUND CIRCUIT OR ELSEWHERE
• Measure the voltage at BCM terminals 6F, 6C and 6E.
― All doors locked: 1.0 V or less → B+→ 1.0 V or less (Normal lock: 6F terminal) (double locking system: 6C terminal)
― Driver-side door unlocked: 1.0 V or less → B+→ 1.0 V or less (Normal unlock: 6E terminal)
• Is the voltage as above?
Yes
Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
No
• Inspect the BCM connector.
• Inspect the wiring harness between the BCM 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.
8
REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR
• Does the keyless entry system operate properly?
Yes
• Troubleshooting completed.
• Explain repairs to the customer.
No
Reinspect the malfunction symptoms, then repeat from Step 1 if malfunction recurs.