NO.3 ADVANCED KEYLESS ENTRY FUNCTION INOPERATIVE [ADVANCED KEYLESS ENTRY AND START SYSTEM]

id0903i1801400

3

Advanced keyless entry 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 BCM.

•  Wrong usage.

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.
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, 3I and 3M while operating the request switch. ― Operate front door request switch (LF) 3K: 5.0 V→1.0 V or less ― Operate front door request switch (RF) 3I: 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 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.
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 5I 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 5I) ― 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.

3	Advanced keyless entry 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 BCM. • Wrong usage.