Illumination Lamp Control Does Not Operate - Mazda MX-5 1990 Workshop Manual

T
Troubleshooti ng
T-90
LIGHTING SYSTEM
Symptom= Illumination lamp control does not operate.
05UOTX-326
05UOTX-325
Remady
1. Turn the headlight switch ON.
2. Set the panel lamp control switch to Max. position.
3. Measure the voltage at the following terminal wires of the
panel lamp control switch connector.
Wire Voltage Action
(B) OV Next check wire (RIB)
Other OV
Repair wire (8)
(Panel lamp control switch - Body ground)
(RIB) 12V Next check wire (R)
OV Repair wire (RIB)
(TAl L 15A fuse - Panel lamp control switch)
(R)
OV Repair wiring harness
(Panel lamp control switch - Each lamp)
Other OV
Replace panel lamp control switch
Inspection
Panel lamp control switch
1. Remove the panel lamp control switch.
2. Apply 12V to terminal d and ground terminal g.
3. Check that the voltage at terminal a changes linealy when
turning the control switch.
Switch Voltage
Min. position
10V
Max. position OV
4. If not as specified, replace the panel lamp control switch.