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	Attempt to start the engine using the key. Does engine start?	Yes	Go to the next step.
2		No	Go to symptom troubleshooting flow No. 3 in ENGINE - SYMPTOM TROUBLESHOOTING [MZI-3.7] .
3	Does the keyless indicator light (green) turn ON when pressing the start knob?	Yes	Go to Step 11.
3		No	If the keyless indicator light (green) does not illuminate: Go to the next step. If the keyless warning light (red) is flushing: Go to Step 6. If the keyless warning light (red) illuminates: Go to Step 9.
4	Bring the transmitter (advanced key) inside the passenger compartment. Measure the voltage at the keyless control module terminal 3E (push switch) while pushing the start knob. Is the voltage 0 V? Does the keyless indicator light (green) turn ON when pressing the start knob?	Yes	Go to the next step.
4		No	Inspect the wiring harness between the steering lock unit and keyless control. If the harness is normal, replace the steering lock unit. If the harness is malfunctioning, repair the wiring harness. Go to the next step.
5	Replace with a transmitter (advanced key) battery known to be good. Bring the transmitter (advanced key) inside the passenger compartment. Does the keyless entry system operate properly?	Yes	Replace the transmitter (advanced key). Then go to the next step.
5		No	Go to the next step.
6	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.
6		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.
7	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.
7		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.
8	Inspect the keyless receiver. (See KEYLESS RECEIVER INSPECTION [ADVANCED KEYLESS ENTRY AND START SYSTEM] .) Is the keyless receiver normal?	Yes	Go to the next step.
8		No	Repair or replace malfunctioning part according to inspection result.
9	Measure the keyless control module terminal 3H voltage. Is the voltage approx. 5.0 V?	Yes	Go to the next step.
9		No	Inspect for open or short circuit between keyless control module terminal 3H (52-pin) and steering lock unit terminal K (12-pin). If the wiring harness is not normal, repair or replace for open or short circuit, then go to the next step. If the wiring harness is normal, go to the next step.
10	Replace steering lock unit. Turn the start knob to START position. Does the advanced keyless start operate properly?	Yes	Troubleshooting completed. Explain repairs to the customers.
10		No	Replace the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND START SYSTEM] .) Then go to the next step.
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.