No. 3 Advanced Keyless Entry Function Inoperative [Advanced Keyless And Start System]

ADVANCED KEYLESS ENTRY FUNCTION INOPERATIVE - POSSIBLE CAUSE

3	Advanced keyless entry function inoperative
POSSIBLE CAUSE	Wrong usage. Malfunction in the transmitter (card key.) Malfunction in the keyless antenna. Malfunction in the keyless receiver. Malfunction in the keyless control module.
Courtesy of MAZDA MOTORS CORP.

ADVANCED KEYLESS ENTRY FUNCTION INOPERATIVE - 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	Did the customer attempt to operate each front doors and trunk lid using the request switch?	Yes	Go to the next step.
		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 (card key) inside the passenger compartment. Close all doors including trunk lid. 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 (card 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.
		No	Go to the next step.
4	Replace with a transmitter (card key) battery known to be good. Operate the transmitter (card key.) Does the keyless entry system operate properly?	Yes	Replace the transmitter (card key.) Then go to Step 9.
		No	Go to the next step.
5	Measure the voltage at the keyless control module terminals 31, 3K and 3M while operating the request switch. Operate passenger's side front door request switch (3I): 5.0 V→1.0 V or less  Operate driver's side front door request switch (3K): 5.0 V→1.0 V or less  Operate trunk lid request switch (3M): 5.0 V→1.0 V or less  Is the voltage as above?	Yes	Go to the next step.
		No	Inspect and repair the applicable wiring harness as necessary, then go to Step 9.
6	Measure the voltage at the following keyless control module terminal while operating the request switch. Terminal 1A and 1B for exterior, RF keyless antenna Terminal 1C and 1D for exterior, LF keyless antenna Terminal 1E and 1F for exterior, rear keyless antenna Terminal 1I and 1J for interior, trunk keyless antenna Terminal 1K and 1L for interior, rear keyless antenna Terminal 1O and 1P for interior, instrument panel keyless antenna Terminal 1M and 1N for interior, front keyless antenna Is the voltage within 4.0-6.0 V?	Yes	Go to the next step.
		No	Inspect and repair the applicable wiring harness between the keyless antenna and the keyless control module. If the wiring harness is okay, replace suspect keyless antenna. Then go to Step 9.
7	Measure the voltage at the keyless control module terminals 3C (keyless receiver) while operating the any request switch. 5.0V→1.0 V or less  Is the voltage as above?	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 Step 9.
8	Measure the voltage at the keyless control module terminals 3Q while operating the request switch. Unlock: 1.0 V or less→B+→1.0 V or less  Is the voltage as above?	Yes	Inspect and repair the wiring harness between the door lock timer unit and the keyless control module, then go to the next step.
		No	Inspect the keyless control module. If the keyless control module is malfunctioning, replace the module. Then go to the next step.
9	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.