Mazda 626 Station Wagon, Workshop Manual

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TROUBLESHOOTING [KEYLESS ENTRY SYSTEM]
TROUBLESHOOTING INDEX
No.
TROUBLESHOOTING ITEM
DESCRIPTION
PAGE
1
On-board diagnostic function
inoperative
CPU’s on-board diagnostic function
does not operate.
(See S-38 NO.1 ON-BOARD
DIAGNOSTIC FUNCTION
INOPERATIVE.)
2 Transmitter ID code cannot be
reprogramed.
CPU’s transmitter ID code
reprogram function does not work.
(See S-40 NO
.2
TRANSMirrER
ID
CODE CANNOT
BE
REPROGRAMMED.)
NO.1 ON-BOARD DIAGNOSTIC FUNCTION INOPERATIVE.
1 On-board diagnostic function inoperative
DESCRIPTIO N
CPU’s on-board diagnostic function does not operate.
P O S S IB LE
C AU S E
• Malfunction in door lock timer unit system
• Malfunction in door lock linkage
• Malfunction in power door lock system
• Malfunction in IG1, +B signal circuit of keyless unit
— Keyless unit power supply fuse malfunction
— Malfunction in wiring harness between keyless unit power supply fuse(s) and keyless
unit itself
• Malfunction in keyless unit’s door open/closed signal circuit
— Door switch, keyless unit or instrum ent cluster print plate malfunction
— M alfunction in wiring harness between instrum ent cluster and door switch(es) or
keyless unit
— M alfunction in wiring harness between keyless unit and door switch(es)
• Malfunction in keyless units liftgate open/close signal circuit
— Cargo com partm ent light switch malfunction
— M alfunction in wiring harness between keyless unit and cargo compartment light
switch
• Malfunction in keyless unit GND signal circuit
— M alfunction in wiring harness between keyless unit and ground
• Malfunction in keyless unit door lock/unlock signal circuit
— Keyless unit malfunction
— M alfunction in wiring harness between keyless unit and door lock timer unit
i
i
Diagnostic procedure
i
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while j
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If i
there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and
undamaged.
STEP INSPECTION ACTION
1 CHECK TO SEE WHETHER MALFUNCTION
IS IN DOOR LOCK TIMER UNIT SYSTEM OR
ELSEWHERE
• Did any of the following items work during
on-board diagnostic function operation?
— All doors locked
— All doors unlocked
Yes
Go to next step.
No Go to Step 3.
2 CHECK TO SEE WHETHER MALFUNCTION
IS IN KEYLESS UNIT OR DOOR LOCK
TIMER UNIT SYSTEM
• Inspect following electrical parts.
— Door lock timer unit, door lock actuators,
related wiring harnesses
• Are they okay?
Yes Replace keyless unit and reprogram transmitter ID
code, then go to Step 16.
No Repair or replace malfunctioning part(s), then go to
Step 16.
3 INSPECT DOOR LOCK LINKAGE SYSTEM
• Operate inner door lock knob and make
sure door locks and unlocks manually.
• Do all door’s lock systems work?
Yes Go to next step.
No Troubleshoot the door lock linkage.
S -3 8