NO.4 ADVANCED KEYLESS START FUNCTION INOPERATIVE [ADVANCED KEYLESS ENTRY AND START SYSTEM]

id0903i1801500

4 | Advanced keyless start function inoperative
POSSIBLE CAUSE | • Malfunction in the transmitter (advanced key). • Malfunction in the keyless control module. • Malfunction in the keyless receiver. • Malfunction in the keyless antenna. • Malfunction in the PCM.

Diagnostic procedure

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.
No | Go to the next step.
2 | • Attempt to start the engine using the key. • Does engine start? | Yes | Go to the next step.
No | Go to symptom troubleshooting flow No.3 in 01-03 section.
3 | • Does the keyless indicator light (green) turn ON when pressing the start knob? | Yes | Go to Step 11.
No | If the keyless indicator light (green) does not illuminate: • Go to the next step. If the keyless warning light (red) is flashes: • 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 B+? • Does the keyless indicator light (green) turn ON when pressing the start knob? | Yes | Go to the next step.
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.
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 1I 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.
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.
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.
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.
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.
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
No | Re-inspect the malfunction symptoms, then repeat form Step 1 if malfunction recurs.