Mazda 6 2002 - Page 850

S132
TROUBLESHOOTING [KEYLESS ENTRY SYSTEM]
End Of Sie
NO. 2 ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE
A6E778269000W07
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If
there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly
and undamaged.
Diagnostic procedure
*6 CHECK TO SEE WHETHER MALFUNCTION
IS IN DOOR LOCK ACTUATOR, DOOR LOCK
TIMER UNIT GROUND CIRCUIT OR
ELSEWHERE
• Measure voltage at door lock timer unit
connector terminal C, D (6 pin) during on-
board diagnostic function operation.
 All door locked: below 1.0 V→B+→below
1.0 V (terminal D, 6 pin)
 All door unlocked: B+→below 1.0 V→B+
(terminal C, 6 pin)
• Is voltage as above?
Yes Recheck malfunction symptoms, then repeat from Step 1 if
malfunction reoccurs.
No • Inspect door lock timer unit connector.
• Inspect wiring harness between door lock timer unit and
door lock actuator.
 If above parts are OK, go to next step.
 If above parts malfunction, repair malfunction part.
7 RECHECK MALFUNCTION SYMPTOM 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.
STEP INSPECTION ACTION
2 All on-board diagnostic functions inoperative
DESCRIPTION
• Malfunction in door lock timer unit power supply circuit, door switch circuit, cargo compartment light
circuit or door lock timer unit ground circuit.
POSSIBLE
CAUSE
• Malfunction in IG1, B+ signal circuit of door lock timer unit
 Door lock timer unit power supply fuse malfunction
 Malfunction in wiring harness between door lock timer unit power supply fuse(s) and door lock timer
unit itself
• Malfunction in door lock timer unit's door open/closed signal circuit
 Door switch system malfunction
 Door lock timer unit malfunction
 Malfunction in wiring harness between door lock timer unit and door switch
• Malfunction in door lock timer unit's liftgate or trunk lid open/closed signal circuit
 Cargo compartment light switch system malfunction
 Door lock timer unit malfunction
 Malfunction in wiring harness between door lock timer unit and cargo compartment light switch
• Malfunction in door lock timer unit GND signal circuit
 Malfunction in wiring harness between door lock timer unit and ground
STEP INSPECTION ACTION
1 INSPECT DOOR LOCK TIMER UNIT POWER
SUPPLY FUSES
• Are door lock timer 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.
2 INSPECT DOOR SWITCH INSTALLATION
• 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.
*3 CHECK TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN FUSE BLOCK AND
DOOR LOCK TIMER UNIT) OR ELSEWHERE
• Turn ignition switch to ON position.
• Measure voltage at following door lock timer
unit terminals:
 IG1 signal (Terminal B (24 pin))
 B+ signal (Terminal A (24 pin))
• Is voltage B+?
Yes Go to next step.
No Repair wiring harness between fuse block and door lock
timer unit, then go to Step 8.