Mazda MX-5 1990 Workshop Manual page 629

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LIGHTING SYSTEM
T
W
(R/B) (R/W)
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(W/B)
05UOTX-088
05UOTX-089
05UOTX·091
Step 3
1. Turn the headiight switch ON.
2. Measure the voltage at the following terminal-wires of the
headlight switch connector.
Wire Headlight switch Voltage Action
12V Next check wire (RIB)
(W/B)
-
Repair wire (W/B)
OV (Headlight relay-Headlight
switch)
(RIB)
12V Go to Step 4
Low beam
OV
Replace headlight switch
12V Go to Step 4
(R/W) High beam
OV Replace headlight switch
Step 4
1. Check the headlight bulbs.
2. If a bulb is burned, replace it.
3. If the bulbs are OK, go to Step 5.
Step 5
1. Disconnect the headlight connectors.
2. Turn the headlight switch ON, and measure the voltage at
the following terminal-wires as shown.
Headlight Wire
Headlight
Voltage
Remedical Action
switch
12V
Repair ground wire (8)
(RIB) Low beam
Repair wire (RIB)
OV
(Headlight switch-Headlight)
Left
12V Repair ground wire (B)
(R/W) High beam
OV
Repair wire (RfW)
(Headlight switch-Headlight)
12V Repair ground wire (B)
(RIB) Low beam
Repair wire (R/W)
OV
(Headlight switch-Headlight)
Right
12V Repair ground wire (B)
(R/W) High beam
OV
Repair wire (R/W)
(Headlight switch-Headlight)
Step 6
1. Turn the headlight switch ON.
2. Measure the voltage at the following terminal-wires of the
headlight switch connector (in the combination switch).
Wire Voltage Action
12V
Next check wire (8)
(L/Y)
OV
Repair wire (L/Y)
(Headlight relay-Headlight switch)
12V Repair ground wire (B)
(B)
OV
Replace headlight switch
T-47