fuse MAZDA MX-5 1994 Owner's Guide

T LIGHTING SYSTEM Troubleshooting Symptom: Stoplights do not illuminate (All). 45UOTX-105 '' HIGH-MOUNT STOPLIGHT 05UOTX-12: Step 1 1. Check STOP 15A fuse in the fuse box. 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. ~easure the voltage at the following terminal wires of the stoplight switch connector. B+: Battery positive voltage Inspection 1 ~erm w I voltage 1 condition Action I B+ I Check B terminal I Repair wiring harness Other I (STOP 15A fuse - Storrliaht switch) I Brake pedal B+ I Go to Step 3 depressed Other 1 Check stoplight switch w -- 1. 6heck the stoplight bulbs. 2. If a bulb is burned, replace it. 3. If the bulbs are OK, go to Step 4. Step 4 Measure the voltage at the following terminal wires of the right and left rear combination light connectors. B+: Batterv ~ositive voltacle -. - '"spection I Terminal I Voltage 1 condition Action Brake pedal depressed B+ Other B+ Other Check F terminal Repair wiring harness (Stoplight switch - Rear combina- tion light) Repair wiring harness (Rear combination light - GND) Check for poor connection of con- nectors Gartner Banana

T LIGHTING SYSTEM Troubleshooting 1 Symptom: Turn and hazard warning function do not operate. I Step 1 Check HAZARD 15A fuse and METER 15A fuse in the fuse block. Step 2 Measure voltage at terminal H (B/R) of the flasher unit connector. Fuse Burnt OK Action Replace fuse after checking and repairing wiring harness Go to Step 2 Step 3 1. Disconnect the flasher unit connector. 2. Check for continuity between terminal A (B) of the flasher unit connector and ground. B+: Battery positive voltage -1 Voltage B+ Other Continuity Step 4 1. Turn the ignition switch ON. 2. Set the turn signal switch ON (right or left) and measure voltage at terminal C (G/Y) and terminal B (G/R) of the combination switch connector (&pin connector). Action Go to Step 3 Repair wiring harness (Hazard fuse - Flasher unit) Action Yes No B+: Battery positive voltage I Terminal I Wire IVoltaae 1 Action I Reconnect connector and go to Step 4 Repairing wiring harness (Flasher unit - GND) C - u (w) ,, .,. I (ti~nl - B+ Others B+ , Others I lnspect combination switch Go to Step 5-1 Inspect combination switch Go to Ster, 5-2 d Gartner Banana

LIGHTING SYSTEM T Symptom: Turn signals do not operate. (Hazard warning function operates normally.) J 45UOTX-I23 Step 1 Check the METER 15A fuse in the fuse block. Fuse 1 Action 1 I Burnt I Replace fuse after checking and repairing wirina harness I OK I GO to step 2 I Step 2 1. Turn the ignition switch to ON. 2. Measure voltage at terminal A(B/Y) of the combination switch connector. Other B+: Battery positive voltage Repair wiring harness (TURN fuse - Combination switch) Voltage B+ Step 3 Set the turn signal switch to ON (right or left) and mea- sure voltage at terminal C (GN) and terminal B(G/R) of the combination switch connector (&pin connector). Action Go to Step 3 B+: Battery positive voltage Terminal I Wire IVoltage 1 Action inspect combination switch (Refer to Daae T-20) Gartner Banana

MAIN FUSE @LOCK MAIN EUE TRADE NUMBER W (F) EACX-uP LIGHTS: 1156 (2%) Ix-oal FUSE BLOCK U ,, HIGH-MOUNT STOPLIGHT: Q1 (18.4W) STOP STCRIMTS: 1157 (27WI PARK/NEUTRAL W/R (F) - SWITCH OoA [X-031 Ix-olll 15A (SECTION H-1) FUSE ELDCK WG (F) 1 MTER 0 L (Fl HORN RELAY G/O (F) STOPLIGHT -12 SWITCH OWERTRAIN ONTROL ACK-UP G/R IGHT AT DATA LINK PASSENGER-SIDE CONNECTW RUISE CONTROL UNIT AIR BAG MOOVLE (SECTION U) m38 ::::s::t::z:::== R/G IF) t G/R G/O t I (F) (Fl G T I R/G G I I (R) (R) R/G G [R) (R) (R) 0, WW REAR COMBINATION LIGHT .BACK-UP LIGHTS .HORN .STOPLIGHTS 1 HIGH-MOUNT STOPLIGHT 1 :-06 PASSENGER-SIOE AIR 8AG HOOULE (F) U i-04 PASSENGER-SIDE AIR BAG MOWLE (F) Gartner Banana

LIGHTING SYSTEM T Troubleshooting Symptom: Back-up light(s) does not illuminate. 45UOTX-I 36 Step 1 1. Check METER 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. Check the back-up light bulbs. 2. If a bulb is burned, replace it. 3. If the bulbs are OK, go to Step 3. Step 3 1. Turn the ignition switch ON, and shift the transmission to reverse. 2. Measure the voltacle at the terminal wires of the rear combination light cknectors. B+: Battery positive voltage . light Action C Left B+ Other Right Check F terminal Go to Step 4 F C T-67 F '+ Other B+ Other Repair wiring harness (Rear combination light - GND) Check for poor connection of back- up light connector Check F terminal Go to Step 4 B+ Other Repair wiring harness (Refer combination light - GND) Check for poor connection of back- up light connector Gartner Banana

T LIGHTING SYSTEM Step 4 1. Disconnect the back-up light switch connectors. 2. Check for continuity between terminals of the switch with the transmission in reverse. i Continuity Action Repair wire harness (METER 15A fuse - I I 45UOTX-139 Back-up Light Removal / Installation Remove and install as shown in the figure. BACK-UP LIGHT Back-up Light Switch Inspection 1. Disconnect the back-up light switch connectors. 2. Check for continuity between terminals of the switch as shown. I . -- Others 1 No Transmission 3. If not as specified, replace the Back-up light switch. Continuity Reverse I yes 1 Gartner Banana

LIGHTING SYSTEM - -- -- Troubleshooting I Symptom: Taillights, side marker lights, and license plate lights do not illuminate. 45UOTX-141 Step 1 1. Check TAIL 15A fuse. 2. If the fuse is burned, replace it. Check and, if necessary, repair the wiring harness. 3. If the fuse is OK, go to Step 2. Step 2 1. Turn the headlight switch ON. 2. Measure the voltage at the following terminal wires of the - TNS relay connedor. B+: Battery positive voltage - Terminal 1 Voltage 1 Action I B+ I Go to Step 3 C (WIL) Other I Check D terminal B+ Other Go to Step 4 Check A terminal A (WIR) Step 3 1. Check the bulbs of each light. 2. If the bulb is burned, replace the bulb. 3. If the bulbs are OK, repair wiring harness between the TNS relay and the body ground of each light. B (WIR) B+ Other Check B terminal Repair wiring harness (TAIL 15A fuse - TNS relay) B+ Other Replace TNS relay Repair wiring harness (TAIL 15A fuse - TNS relay) Gartner Banana

T LIGHTING SYSTEM DAYTIME RUNNING LIGHTS (DRL) (CANADA SPEC.) Circuit Diagram '-2 - CANADA DAYTIME RUNNING LIGHTS (DRL) MAIN FUSE BLOCK I) MAIN \ \ /I IX-021 [X-031 FUSE BLOCK OFF WIPER \ If \ &E-1 1 OAL CONTROL UNIT I - IGNITION SWITCH xz U I LU 12 am2 z -wc YYU maw <urn am- - 1 1 DRL CONTROL UNIT (F) Gartner Banana

LIGHTING SYSTEM T Symptom: Daytime running lights (DRL) do not illuminate. (Turn signals function normally.) DRL operate with engine running and following switches are off: Headlight switch Turn signal switch (Selected turn signal light flashes, other light remains illumi- nated) Hazard warning switch Parking brake switch (Parking brake released) Step 1 1. Position the vehicle on a flat surface and block the wheels to prevent vehicle movement. 2. Turn the ignition switch to ON. 3. Measure the voltage at the following terminal wires of the DRL control unit. 4. If correct, replace the DRL control unit. B+: Battery positive voltage Step 2 1. Disconnect the parking brake switch connector. 2. Check for continuity between the terminal of the switch and a body ground. Terminal J (L) u Connected to WIPER 20A fuse I(B) B (R) C (WIR) Parking brake lever Pulled one notch Continuity Yes Released Test condition Constant GND Parking brake switch Headlight switch No I 3. If not as specified, adjust or replace the parking brake switch. 4. If correct, repair wiring harness. (DRL control unit - Parking brake switch) Specification B+ Constant Parking brake released Headlight switch off Action Repair wiring harness (WIPER 20A - DRL control unit) Other B+ Other Repair wiring harness (DRL control unit - GND) Go to Step 2 Go to Step 3 Gartner Banana

MAIN FUSE BLOCK FUSE BLOCK C-2 6 PMRmAIN L/R CONTROL MMULE (ENGINE1 (YCTIaN 0-1cl .CIGARETTE LIGHTER .INTERIOR LIGHT .REAR WINDOW OEFROSTER INSTRUMENT WINCmW DEFROSTER WOR SWITCHES (SECTIDN TI -05 REAR WINX)W DEFROSTER RELAY(R) -00 CIGARETTE LIGHTER (I) I-m REAR (R) -REAR NO. 2 (~21 11-07 REAR W INWW DEFROSTER IR21 1-09 INTERIOR LIGHT (I1 E-10 REAR WINOOW DEFROSTER SWITCH (It 1 Gartner Banana