Mazda MX-6 1998, Workshop Manual, Page: 1044 / 1282

TROUBLESHOOTING [EXTERIOR LIGHTING SYSTEM]
Headlights do not illuminate
TROUBLESHOOTING HINTS
Malfunction in headlight power supply/ground circuit
0 Headlights do not illuminate
• Malfunction in wiring harness between battery and headlight relay
• Malfunction in wiring harness between headlight high relay and ground (With DRL)
• Malfunction in wiring harness between battery and headlight high relay
Malfunction in headlight input signal circuit
© Headlights do not illuminate
• Headlight relay malfunction
• Headlight high relay malfunction (With DRL)
• Light switch (headlight switch) malfunction
Malfunction in headlight operation circuit
0 Headlights do not illuminate
CPU malfunction
HEAD (LH) 15 A fuse and HEAD (RH) 15 A fuse malfunction
Malfunction in wiring harness between CPU and light switch (headlight switch)
Malfunction in wiring harness between headlight and CPU
Malfunction in wiring harness between headlight relay and CPU
Malfunction in wiring harness between headlight and headlight high relay (With DRL)
Malfunction in wiring harness between headlight and light switch (headlight switch)
Malfunction in wiring harness between headlight relay and headlight
Malfunction in wiring harness between headlight high relay and CPU
STEP
INSPECTION
Remove headlight relay.
Measure voltage at terminals A and B at
headlight relay connector.
Is voltage B+?
W 6 U 9 0 1 W M 6
Yes
No
ACTION
Go to nex! step.
Repair wiring harness between battery and headlight
relay.
Inspect headlight relay.
a- 0 9-18 HEADLIGHT RELAY
INSPECTION
Is headlight relay okay?
Yes Go to next step.
No
Replace headlight relay.
Install headlight relay.
Turn headlight switch to second position.
Measure voltage at terminal C at headlight
connector of wiring harness.
Is voltage B+?
Yes Go to step 5.
No Go to next step.
W 6 U 9 0 1 W M 8
0 9 -0 1 J -4