Mazda 626 - Transmitter ID Code Cannot be Reprogrammed

TROUBLESHOOTING [KEYLESS ENTRY SYSTEM]
STEP INSPECTION ACTION
13*
INSPECT WIRING HARNESS BETWEEN
KEYLESS UNIT AND GROUND FOR
CONTINUITY
• Is there continuity between keyless unit
connector terminal L and ground?
Yes Go to next step.
No
Repair wiring harness between keyless unit and
ground, then go to Step 16.
14*
INSPECT WIRING HARNESS BETWEEN
KEYLESS UNIT AND DOOR SWITCHES
FOR CONTINUITY
• Open the driver’s door.
• Is there continuity between keyless unit
connector terminal C and ground?
Yes Go to next step.
No
Repair wiring harness between keyless unit and door
switch (es), then go to Step 16.
15*
INSPECT WIRING HARNESS FOR
CONTINUITY BETWEEN KEYLESS UNIT
AND CARGO COMPARTMENT LIGHT
SWITCH
• Open the liftgate.
• Is there continuity between keyless unit
connector terminal D and ground?
Yes
Replace keyless unit and reprogram transmitter ID
code, then go to next step.
No
Repair wiring harness between keyless unit and cargo
compartment light switch, then go to next step.
16 CONFIRM THAT MALFUNCTION
SYMPTOMS DO NOT REOCCUR AFTER
REPAIR
• Does keyless entry system operate
properly?
Yes Troubleshooting completed.
Explain repairs to customer.
No Recheck malfunction symptoms, then repeat from Step
1 if malfunction reoccurs.
NO. 2 TRANSMITTER ID CODE CANNOT BE REPROGRAMMED.
2
Transmitter ID code cannot be reprogrammed.
DESCRIPTION CPU’s transmitter ID code reprogram function does not work.
POSSIBLE
CAUSE
• Malfunction in transmission circuit
— Transmitter battery, transmitter, keyless unit bracket, keyless unit bracket ground screw or
keyless unit malfunction
Diagnostic procedure
STEP INSPECTION ACTION
1
INSPECT TRANSMITTER BATTERY
INSTALLATION AND TYPE
• Visually inspect transmitter battery.
• Are below items okay?
— Transmitter battery installation (correct
polarity)
— Battery type (CR2025)
Yes
Go to next step.
No
Set transmitter battery properly or replace with
specified transmitter battery (CR2025), then go to Step
8.
2 INSPECT TRANSMITTER BATTERY
TERMINALS FOR RUST AND POOR
CONNECTION
• Visually inspect transmitter.
— Is there rust on transmitter battery
terminals (positive or negative pole)?
— Is there poor connection between
terminals and battery ?
Yes
Replace transmitter battery or repair transmitter battery
terminal, then go to Step 8.
No
Go to next step.
3 INSPECT TRANSMITTER BATTERY
• Inspect transmitter battery.
• Is battery voltage normal?
Yes Go to next step.
No Replace transmitter battery, then go to Step 8.
4
INSPECT KEYLESS UNIT BRACKET
INSTALLATION
• Is keyless unit bracket installed securely?
Yes Go to next step.
No Install bracket securely, then go back to Step 6 of
keyless entry system preliminary inspection.
S-40