NO.2 ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE [KEYLESS ENTRY SYSTEM]
id0903d2800700
2
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All on-board diagnostic functions inoperative
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DESCRIPTION
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• Malfunction in keyless control module power supply circuit, door switch circuit, trunk lid compartment light circuit, keyless control module ground circuit, or keyless receiver.
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POSSIBLE CAUSE
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• Malfunction in IG1 or B+ signal circuit of keyless control module
• Malfunction in door open/closed signal circuit of keyless control module
• Malfunction in trunk lid open signal circuit of keyless control module
• Malfunction in keyless control module GND signal circuit
• Malfunction in keyless receiver
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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INSPECT KEYLESS CONTROL MODULE POWER SUPPLY FUSES
• Are the keyless control module power supply fuses normal?
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Yes
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Go to the next step.
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No
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Inspect for a short to ground in circuit of blown fuse. Repair or replace if necessary.
Install an appropriate amperage fuse.
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2
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INSPECT DOOR SWITCH INSTALLATION
• Are the door switches installed securely?
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Yes
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Go to the next step.
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No
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Install the door switches securely, then go back to Step 5 of KEYLESS ENTRY SYSTEM PRELIMINARY INSPECTION.
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*3
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS CONTROL MODULE) OR ELSEWHERE
• Turn the ignition switch to the ON position.
• Measure the voltage at the following keyless control module terminals:
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Repair the wiring harness between the fuse block and keyless control module, then go to Step 12.
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*4
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (SHORT TO B+ BETWEEN FUSE BLOCK AND KEYLESS CONTROL MODULE, OR BETWEEN KEYLESS CONTROL MODULE AND GROUND) OR ELSEWHERE
• Turn the ignition switch to the LOCK position.
• Disconnect the keyless control module connector.
• Measure the voltage at the following keyless control module connector terminal:
• Is the voltage B+?
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Yes
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Repair the malfunctioning wiring harness, then go to Step 13.
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No
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Go to the next step.
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*5
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS CONTROL MODULE AND GROUND) OR ELSEWHERE
• Is there continuity between keyless control module connector terminal 3C and ground?
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Yes
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Go to the next step.
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No
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Repair the wiring harness between the keyless control module and ground, then go to Step 12.
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6
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INSPECT FOR CHECK CODE 04 IN INSTRUMENT CLUSTER
• Inspect the door switch using the instrument cluster input/output check mode.
• Is DTC 04 displayed?
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Yes
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Go to the next step.
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No
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Repair the door switch system using the DTC 04 inspection procedure, then go to Step 12.
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7
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INSPECT KEYLESS CONTROL MODULE OR WIRING HARNESS (BETWEEN KEYLESS CONTROL MODULE AND DOOR SWITCHES, TRUNK LID COMPARTMENT LIGHT SWITCH FOR CONTINUITY)
• Open the driver-side door.
• Is there continuity between keyless control module connector terminal 4Q, 4T, 3Z and ground?
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Yes
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Replace the keyless control module and reprogram the keyless control module ID code, then go to the next step.
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No
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Repair the wiring harness between the keyless control module, door switches, and trunk lid compartment light switch, then go to the next step.
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8
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN FUSE BLOCK AND KEYLESS RECEIVER) OR ELSEWHERE
• Turn the ignition switch to the ON position.
• Measure the voltage at the following keyless receiver terminal:
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Repair the wiring harness between the fuse block and keyless receiver, then go to Step 12.
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9
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND GROUND) OR ELSEWHERE
• Is there continuity between keyless receiver connector terminal E and ground?
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Yes
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Go to the next step.
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No
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Repair the wiring harness between the keyless receiver and ground, then go to Step 12.
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10
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INSPECT IF MALFUNCTION IS IN WIRING HARNESS (NO CONTINUITY BETWEEN KEYLESS RECEIVER AND KEYLESS CONTROL MODULE) OR ELSEWHERE
• Turn the ignition switch to the ON position.
• Disconnect the keyless receiver connector and keyless control module.
• Is there continuity between the following terminals?
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Yes
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Go to the next step.
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No
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Repair the wiring harness between the keyless receiver and keyless control module, then go to Step 12.
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11
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INSPECT IF MALFUNCTION IS IN KEYLESS RECEIVER OR KEYLESS CONTROL MODULE
• Measure the signal wave pattern of keyless control module terminal 3U using an oscilloscope while the transmitter is operated with the auxiliary key removed from the ignition key cylinder.
• Does the wave pattern change when the transmitter is operated?
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Yes
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Replace the keyless control module, then go to the next step.
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No
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Replace the keyless receiver, then go to the next step.
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12
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REINSPECT MALFUNCTION SYMPTOM AFTER REPAIR
• Does the keyless entry system operate properly?
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Yes
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Troubleshooting completed.
Explain repairs to the customer.
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No
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Reinspect the malfunction symptoms, then repeat from Step 1 if the malfunction recurs.
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