1994 MAZDA MX-5 fuse

LIGHTING SYSTEM T - --- -- Troubleshooting I Symptom: Interior llght(s) do not illuminate. 45UOTX-161 CONTRYL SWITCH Step 1 Verify the trouble symptom by operating the control switch and opening the doors. Go to the specified Step. Symptom Interior light(s) do not illuminate when control switches are in any position Step 2 1. Check the ROOM 10A fuse. 2. If the fuse is burned, replace it. Check and repair the wire harness if necessary. 3. If the fuse is OK, go to Step 3. Next step Step 2 Interior light(s) illuminate when control switches are in ON position, but do not illumi- nate with door open when switches are in DOOR position lnterior light(s) illuminate when control switches are in DOOR position, but do not illuminate when switches are in ON position Step 3 1. Check the bulb of each light. 2. If a bulb is burned, replace it. 3. If the bulbs are OK, go to Step 4. Step 5 Step 7 45UOTX-162 Gartner Banana

T LIGHTING SYSTEM Step 4 1. Set the control switches to ON position. 2. Measure the voltage at the following terminal-wires of each interior light connector. d B+: Batterv ~ositive voltaae Terminal Voltage B+ Other Step 5 1. Open both doors, and set the control switches to DOOR position. 2. Measure the voltage at terminal wire B (R/W) of each in- terior light connector. B+: Battery positive voltage --' Action Check C terminal Repair wiring harness (ROOM 10A fuse - Interior light) - c (B) Terminal I Voltage I Action I B+ I Go tp Step 6 I (WW) I Other I Redace interior liaht assembly B* Other Repair wiring harness (Interior light - GND) Replace interior light assembly Step 6 1. Disconnect the door switch connector, and check conti- nuity of each switch. 2. If not as specified, replace the door switch. 3. If the switches are OK, repair wiring harness. (Interior light - Door switch) Switch Pushed Released Step 7 1. Set the control switches to ON position. 2. Measure the voltage at terminal wire C (B) of the interior light connector. Continuity No Yes B+: Batterv ~ositive voltaae I Terminal I Voltage I Action I c (4 B+ Other Repair wiring harness (Interior light - GND) Replace interior liaht assembly Gartner Banana

T HORN Symptom: Horn does not sound. 05UOTX-191 Step 1 1. Check the STOP 15A fuse. 2. If the fuse is burned, replace it. Check and repair the wire harness, if necessary. 3. If the fuse is OK, go to Step 2. Step 2 1. Disconnect the horn connector. 2. Apply battery positive voltage to the horn, and check if the horn sounds. 3. If the horn sounds, go to Step 3. 4. If the horn does not sound, replace the horn. Step 3 1. Remove the knee protector. 2. Ground the terminal B (GIO) of the horn relay connector. 3. If the horn sounds, go to Step 4. 4. If the horn does not sound, go to Step 6. Step 4 1. Disconnect the negative battery cable. 2. Remove the air bag module. (Refer to page T-204.) 3. Check for continuity between the terminal of the horn switch connector and the steering shaft. I OFF I No I Horn switch ON 4. If correct, go to Step 5. 5. If not as specified, replace the horn switch and steering wheel as an assembly. Verify that the air bag system is operating normally by monitoring the air bag warning light. Continuity Yes Gartner Banana

HORN T Step 6 1. Ground the terminal B (GIO) of the horn relay connector. 2. Measure the voltage at the following terminal wires of the horn relay connector. Step 5 1. Remove the knee protector. 2. Disconnect the clock spring connector. 3. Check for continuity of the clock spring connector as shown in the figure. B+: Batterv ~ositive voltaae Continuity Yes No A (WIG) Actlon Repair wiring harness (Horn relay - Clock spring connector) Replace combination switch D (WIG) Voltage B+ Repair wiring harness Other I (STOP l5A fuse - Horn relay) Action Check D terminal Other B+ Repair wiring harness (STOP 15A fuse - Horn relay) Check C terminal REMOVAL I INSTALLATION Horn Remove and install as shown in the figure. Horn Switch 1. Disconnect the negative battery cable. u C (GIR) '+ Other Repair wiring harness (Horn relay - Horn) Replace horn relay Gartner Banana

FUSE BCOCK IX-031 I 1,05);;;! rAR WINOOW OEFROSTER 1-05 --: RELAY FUSE BLOCK 1-2 .CIGARETTE LIGHTER .INTERIOR LIGHT .REAR WINDOW DEFROSTER MAIN FUSE BLOCK FUSE BLOCK W/R (F) -- ;; ROOM L/R (FI IX-04 'OA &g [x-ZZI 1 - eh FUSE CONTROL MOOUCE (EWGINEI (SECTION 8- tc) INSTRVMENT CLUSTER (SECTION C-a) t OOW SWITCHES (SECTION T) INTERIOR LIGHT OFF. ON !;. (I1 OB CIGARETTE L .IGHTER (I) 1-09 INTERIOR LIGHT (11 I I Z-10 REAR WINOOW DEFROSTER SWITCH (I) I Gartner Banana

REAR WINDOW DEFROSTER T u Symptom: Rear window defroster does not operate. 9MUOTX-232 Step 1 1. Check the following fuses. I Fuse Amperage I Location I 2. If all the fuses are OK, go to Step 2. 3. If a fuse is burned out, replace it. Check and repair the wire harness, if necessary. R.DEF HEATER -- M: Continuity 20A 30A Step 2 1. Disconnect the rear window defroster relay. 2. Apply battery positive voltage and check for continuity between terminals of the relay. B+: Battery positive voltage 3. If correct install the rear window defroster relay and go to Step 3. 4. If not as specified, replace the rear window defroster relay. Fuse box No.2 Main fuse block Step 1 2 C Terminal D 0 GND B 0 B+ A 0 C 0 Gartner Banana

T REAR WINDOW DEFROSTER Step 3 1. Turn the ignition switch to on. 2. Turn the rear window defroster switch on. 3. Check the voltage at the terminal wires of the rear win- d dow defroster rday connector. B+: Battery positive voltage Terminal (uB) c (R) Step 4 Check if the heater operates in the first position. I Operation I Action I Voltage B+ other NG Repair wiring harness (Heater switch- Rear window defrostertimer unit) Action Check C terminal Repair wiring harness (HEATER fuse - Relav) B+ Other . , Go to Step 4 Go to Step 5 I Step 5 Check the voltage at the rear window defroster connec- tors. Check A terminal Repair wiring harness (DEFOG fuse - Relavl A (w) B+: Battery positive voltage B+ Other Terminal I Voltage I Action B+ I Check C terminal other If all above-mentioned parts are normal, replace the rear window defroster timer unit. Repair wiring harness (Defroster - Defroster timer unit) c (W) A (B) . B+ Other B+ Other Check A terminal Repair wiring harness (Relay- Defroster) Repair wiring harness (Defroster - GND) Repair defroster filament Gartner Banana

T CRUISE CONTROL SYSTEM TROUBLESHOOTING Before troubleshooting the system, check the following items: 1. Is the customer using the system correctly? 2. Is the fuse burnt? If it is, replace it after checking and repairing the wiring harness. d Symptom: Vehicle speed cannot be set. (Cruise control unit will not hold vehicle speed.) 45UOTX-189 ("pj") SRUISE MAIN Step 1 1. Turn the ignition switch ON. 2. Turn the cruise control main switch ON. 3. Check that the main switch indicator light comes ON. 4. If the light does not come ON, go to Step 2. 5. If the light comes ON, go to Step 3. Step 2 1. Check for continuity between the terminals of the cruise control main switch. Neutral OFF I Position M: Continuity 2. If not as specified, replace the switch. 3. If the switch is OK, repair the wiring harness. (METER 15A fuse - Cruise control main switch - GND) Terminal A~B~D~F~G~H Step 3 1. Measure the voltage at the following terminal wires of the cruise control unit connector. Disconnect the CIS control unit connector before measuring the voltage at terminal J. 2. If all terminal voltage are OK, replace the cruise control unit. -- / Gartner Banana