Diagnostic Procedure

DIAGNOSTIC PROCEDURE CHART

STEP	INSPECTION		ACTION
1	Retrieve the advanced keyless system DTC using the M-MDS. Are there DTC displayed?	Yes	Perform the applicable DTC diagnostic procedures.
1		No	Go to the next step.
2	Did the customer attempt to operate each front doors and liftgate using the request switch?	Yes	Go to the next step.
2		No	Inspect the advanced keyless system operations using the request switch. If the advanced keyless system is inoperative, then go to the next step.
3	Prepare the followings: Make sure that there is no transmitter (advanced key) inside the passenger compartment. Close all doors including liftgate. Remove the key from the steering lock. Make sure that start knob is to the LOCK position. (Do not Press the knob) Make sure that the transmitter (advanced key) is within the advanced keyless system operative area (within 80 cm {2.6 ft} from front door) Does the advanced keyless system operate properly?	Yes	The system is normal. Explain the advanced keyless system operation.
3		No	Go to the next step.
4	Replace with a transmitter (advanced key) battery known to be good. Operate the transmitter (advanced key). Does the keyless entry system operate properly?	Yes	Replace the transmitter (advanced key). Then go to the next step.
4		No	Go to the next step.
5	Measure the voltage at the keyless control module terminals 3K, 31 and 3M while operating the request switch. Operate driver-side front door request switch (3K): 5.0 V → 1.0 V or less Operate passenger-side front door request switch (31): 5.0 V → 1.0 V or less Operate liftgate request switch (3M): 5.0 V → 1.0 V or less Is the voltage as above?	Yes	Go to the next step.
5		No	Inspect and repair the applicable wiring harness as necessary, then go to the next step.
6	Turn the start knob to LOCK position with mechanical key is not in ignition switch, and the start knob is not pushed. Measure the voltage following keyless control module connector. Terminal 3F (keyless switch): below 1.0 V Terminal 3E (start knob (push switch)): below 1.0 V Terminal 2E (ACC voltage): below 1.0 V Terminal 2C (IG1 voltage): below 1.0 V Is the signal voltage normal?	Yes	Go to the next step.
6		No	Inspect and repair for open or short circuit in wiring between the suspect switch and keyless control module, then go to the next step.
7	Measure the pulse profile using an oscilloscope at following keyless control module terminal (52-pin). Terminal 1A for exterior, RF keyless antenna Terminal 1C for exterior, LF keyless antenna Terminal 1E for exterior, rear keyless antenna Terminal 11 for interior, rear keyless antenna Terminal 1K for interior, middle keyless antenna Terminal 1M for interior, front center keyless antenna Compare the pulse signal generating frequency between advanced key in communication areas and out of it. Is the pulse signal generating frequency at advanced key in communication areas become longer than out of it? NOTE: The pulse signal generating frequency at advanced key in communication areas twice as longer than out of it.	Yes	Go to the next step.
7		No	Inspect for open or short circuit between suspect keyless antenna and keyless control module. If the wiring harness normal, replace suspect keyless antenna, then go to the next step. If the wiring harness is not normal, repair or replace for open or short circuit, then go to the next step.
8	Measure the pulse profile using an oscilloscope at the keyless control module terminal 3C while operating the transmitter (advanced key). Is the pulse profile become long at moment of transmitter operation?	Yes	Go to the next step.
8		No	Inspect the wiring harness between the keyless receiver and the keyless control module. If the harness is normal, replace the keyless receiver. If the harness is malfunctioning, repair the wiring harness. Go to the next step.
9	Inspect for open or short circuit between keyless control module terminal 3Q terminal and BCM terminal 3B. Is the wiring harness normal?	Yes	Reconnect the connectors, then go to the next step.
9		No	Repair or replace for open or short circuit.
10	Measure the voltage at the BCM terminals 5l and 5E while operating the transmitter. Lock driver-side door with the transmitter (advanced key): 1.0 V or less → B+ → 1.0 V or less (terminal 51) Unlock driver-side door with the transmitter (advanced key): 1.0 V or less → B+ → 1.0 V or less (terminal 5E) Is the voltage as above?	Yes	Inspect and repair the wiring harness between the BCM and the door lock actuator. Inspect for door lock actuator. Go to the next step.
10		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION .)
11	Does the keyless entry system operate properly?	Yes	Troubleshooting completed. Explain repairs to the customers.
11	Does the keyless entry system operate properly?	No	Re-inspect the malfunction symptoms, then repeat form Step 1 if malfunction recurs.