Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING [KEYLESS ENTRY SYSTEM]
1 STEP INSPECTION ACTION
4 CHECK TO SEE WHETHER MALFUNCTION
IS IN DOOR LOCK TIMER UNIT, DOOR
LOCK ACTUATOR, A KEY CYLINDER
SWITCH AND RELATED WIRING HARNESS,
OR ELSEWHERE
• Do all of the following items work when
Inserting ignition key into driver's door key
cylinder and operating ignition key?
— All doors locked
— All doors unlocked
Yes Go to Step 6.
No Go to next step.
5*
INSPECT POWER DOOR LOCK SYSTEM
• Turn ignition switch to LOCK position.
• Disconnect keyless unit connector.
• Measure voltage at keyless unit connector
terminal 0.
• Is voltage approximately 5 V?
Yes
Inspect power door lock system except for driver’s
door key cylinder switch and wiring harness (door lock
timer unit and keyless unit, driver’s door key cylinder
switch).
No Inspect power door lock system, then go to Step 16.
6 INSPECT KEYLESS UNIT POWER SUPPLY
FUSES
• Are keyless unit power supply fuses okay?
Yes Go to next step.
No
Check for a short to ground on blown fuse’s circuit.
Repair or replace as necessary.
Install appropriate amperage fuse.
7 INSPECT DOOR SWITCHES
• Are door switches installed securely?
Yes
Go to next step.
No Install door switch(es) securely, then go back to Step 5
of keyless entry system preliminary inspection.
8 INSPECT CARGO COMPARTMENT UGHT
SWITCH
• Is cargo compartment light switch installed
securely?
Yes Go to next step.
No
Install cargo compartment light switch securely, then
go back to Step 5 of keyless entry system preliminary
inspection.
9
INSPECT FOR DTC 04 IN
INSTRUMENT CLUSTER
• Inspect door switch using instrument cluster
input/output check mode.
(See T-26 INSTRUMENT CLUSTER
INSPECTION)
• Does DTC 04 function properly?
Yes Go to next step.
No
Repair door switch system using DTC 04 inspection
procedure, then go to Step 16.
10* INSPECT WIRING HARNESS BETWEEN
KEYLESS UNIT POWER SUPPLIES AND
KEYLESS UNIT FOR CONTINUITY
• Turn ignition switch to ON position.
• Measure voltage at following keyless unit
terminals:
— IG1 signal (Terminal A)
— B+ signal (Terminal B)
• Is voltage approximately 12 V?
Yes Go to next step.
No Repair wiring harness between fuse block and keyless
unit, then go to Step 16.
11* INSPECT WIRING HARNESS FOR
CONTINUITY BETWEEN KEYLESS UNIT
AND DOOR LOCK TIMER UNIT
• Turn ignition switch to LOCK.
• Disconnect keyless unit connector.
• Measure voltage at keyless unit connector
terminal 0.
• Is voltage approximately 5V?
Yes Go to next step.
No Repair wiring harness between keyless unit and door
lock timer unit, then go to Step 16.
12* INSPECT WIRING HARNESS BETWEEN
KEYLESS UNIT POWER SUPPLY, KEYLESS
UNIT AND GROUND FOR SHORT TO B+
• Disconnect keyless unit connector.
• Measure voltage at following keyless unit
connector terminals:
— IG1 signal (Terminal A)
— Ground signal (Terminal L)
• Is voltage approximately 12 V?
Yes
Repair malfunctioning wiring harness, then go to Step
16.
No Go to next step.
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