Headlight Switch Inspection - Mazda MX-5 1990 Workshop Manual

(W/R) (R/L)
(RIB) (R/w)
LIGHTING SYSTEM
T
05UOTX-299
Step 4
1 . Reconnect the headlight connector.
2. Remove the column cover.
3. Measure the voltage at the following terminal-wires of the
headlight switch connectors (in the combination switch) as
shown.
Wire
Headlight
Voltage Action
switch
12V Next, check wire
(W/R)
(R/L) Any position
OV
Repair wire (R/L) (HEAD 30A
fuse-Headlight switch)
12V Next, check wire (R/W)
(W/R) Any position
OV
Repair wire (W/R) (8TN 40A
fuse-Headlight switch)
(R/W)
ON
12V Next, check wire (R/B)
(High beam)
OV Go to Step 5
ON
12V
Check for poor connection of
(RIB)
(Low beam)
headlight switch connector
OV
Go to Step 5
Step 5 - Headlight switch inspection
1. Disconnect the headlight switch connectors.
2. Check for continuity between terminals as shown with an
ohmmeter.
Position
Terminal
HB HL HU BA BTN TNS
Low beam
0 - - 0 0 - - 0
Headlight
0
0
D
0 - - 0
High beam
Parking
0 - ~
Tail, Parking 0 -
r-o
0--0:
Indicates continuity
3. If not as specified, replace the headlight switch.
4. If correct, check for a poor connection in the system.
T-49