Mazda 1996 626 Service Manual page 288

I I ______________________ REAR W INDOW DEFROSTER
Checklist
Procedure / Proper operation
Operate rear window defroster
switch and verify that rear window
defroster turns on and off.
Symptom
Flowchart No.1
Possible cause
• Burnt DEFOG 40A fuse
• Damaged rear window defroster relay
• Damaged rear window defroster switch
• Damaged rear window defroster
11— 6
Symptom
Rear window defroster does not operate
Rear window defroster does not operate
• Damaged CPU
• Open or short circuit in wiring harness
• Poor connection of connector
Step 1
Check the DEFOG 40A fuse in the main fuse block.
Fuse
OK
Burnt
Step 2
1. Turn the ignition switch to ON.
2. Press the rear window defroster switch.
3. Measure the voltage at terminal C (B/L) of the rear win­
dow defroster relay connector.
Voltage
B+
Other
Step 3
Measure the voltage at the terminal (B/L) of the fila­
ment.
Voltage
B+
Other
Flowchart No.
Action
Go to Step 2
Replace fuse after checking and repairing
wiring harness
B+: Battery positive voltage
Action
Go to Step 3
Go to Step 5
B+: Battery positive voltage
Action
Go to Step 4
Repair wiring harness
(Rear window defroster relay— Filament)
1