NO. 2 ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE

BME090369000W04

• 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.

2

All on-board diagnostic functions inoperative

DESCRIPTION

• Malfunction in keyless unit power supply circuit, or keyless unit ground circuit.

POSSIBLE CAUSE

• Malfunction in IG1, B+ signal circuit of keyless unit
- Keyless unit power supply fuse malfunction
- Malfunction in wiring harness between keyless unit power supply fuse(s) and keyless unit itself
• Malfunction in keyless unit door open/closed signal circuit
- Door switch system malfunction
- Keyless unit malfunction
- Malfunction in wiring harness between keyless unit and door switch
• Malfunction in keyless unit GND signal circuit
- Malfunction in wiring harness between keyless unit and ground

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT KEYLESS UNIT POWER SUPPLY FUSES

• Are keyless unit power supply fuses okay?
Yes
Go to next step.
No
Inspect for short to ground on blown fuse circuit. Repair or replace if necessary.
Install appropriate amperage fuse.
2

INSPECT DOOR SWITCH INSTALLATION

• Are door switches installed securely?
Yes
Go to next step.
No
Install door switch(es) securely, then go back to Step 5 of keyless entry system preliminary inspection.
*3

CHECK TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS UNIT) OR ELSEWHERE

• Turn ignition switch to ON position.
• Measure voltage at following keyless unit terminals or short cord terminals:
- IG1 signal (Terminal A)
- B+ signal (Terminal B)
• Are voltages B+?
Yes
Go to next step.
No
Repair wiring harness between fuse block and keyless unit, then go to Step 8.
*4

CHECK TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN FUSE BLOCK AND KEYLESS UNIT, OR BETWEEN KEYLESS UNIT AND GROUND) OR ELSEWHERE

• Turn ignition switch to LOCK position.
• Disconnect keyless unit connector.
• Measure voltage at following keyless unit connector terminal or short cord connector terminal:
- IG1 signal (Terminal A)
• Is voltage B+?
Yes
Repair malfunctioning wiring harness, then go to Step 8.
No
Go to next step.
*5

CHECK TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (LACK OF CONTINUITY BETWEEN KEYLESS UNIT AND GROUND) OR ELSEWHERE

• Is there continuity between keyless unit connector terminal L or short cord connector terminal L and ground?
Yes
Go to next step.
No
Repair wiring harness between keyless unit and ground, then go to Step 8.
6

CHECK FOR CHECK CODE 04 IN INSTRUMENT CLUSTER

• Inspect door switch using instrument cluster input/output check mode.
(See Section T)
• Does DTC 04 function properly?
Yes
Go to next step.
No
Repair door switch system using DTC 04 inspection procedure, then go to Step 8.
7

INSPECT KEYLESS UNIT OR WIRING HARNESS (BETWEEN KEYLESS UNIT AND DOOR SWITCHES, CARGO COMPARTMENT LIGHT SWITCH FOR CONTINUITY)

• Open the driver-side door.
• Is there continuity between keyless unit connector terminals C or short cord connector terminal C and ground?
Yes
Replace keyless unit and reprogram keyless unit ID code, then go to next step.
No
Repair wiring harness between keyless unit and door switch(es), then go to 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.