1994 MAZDA MX-5 Workshop Manual

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 T TAILLIGHTS, SIDE MARKER LIGHTS, PARKING LIGHTS AND LICENSE PLATE LIGHTS Circuit ~iagram 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

LIGHTING SYSTEM TNS RELAY Step 4 1. Disconnect the negative battery cable. 2. Remove the knee protector. 3. Disconnect the combination switch connector. 4. Check for continuity between the following terminals of the combination switch. m: Continuity 5. If not as specified, replace the combination switch. 6. If correct, repair the wiring harness. (TNS relay - combination switch) Removal 1 Installation Remove and install as shown in the figures. raillights Parking lights 3ide marker lights License plate lights 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

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

T LIGHTING SYSTEM Step 3 1. Remove the column cover and disconnect the connec- tors of the headlight switch. 2. Check for continuity between the terminals of the head- Q light switch connector. Position I Terminal I I I I Headlight High beam I I 3. If not as specified, replace the combination switch. 4. If correct, repair wiring harness. (Headlight switch - DRL control unit) I Symptom: Daytime running lights (DRL) function does not cancel. OSUOTX-161 Headlight Low beam Step 1 1. Turn the ignition switch ON. 2. Verify the symptom by operating the following switches; the DRL should cancel. Go to the specified Step. Headlight switch. Hazard warning switch. Turn signal switch. Parking brake switch (lever pulled one notch). 0 1 0 0---0 : Continuity Symptom: DRL function not canceled when Headlight switch ON I Parking brake switch ON Step 5 I 05UOTX-163 Next Step Step 2 Hazard warning switch ON Turn signal switch ON Step 4 Step 4 4. If not as specified, go to Step 3. 5. If correct, replace the DRL control unit. Step 2 1. Turn on the ignition switch. 2. Turn on the headlight switch. 3. Check the voltage at the terminal wire C (WIR) of the DRL control unit connector. B+: Battery positive voltage J Terminal Voltage C (WIR) B+ Gartner Banana

LIGHTING SYSTEM T Step 3 1. Remove the column cover and disconnect the connec- tors of the headlight switch. 2. Check for continuity between the terminals of the head- light switch connector. Position I- Terminal 0---0: Continuity HL Headlight High beam Headlight Low beam 3. If not as specified, replace the combination switch. 4. If correct repair wiring harness. (Headlight switch - DRL control unit) B A 1. Turn on the ignition switch. 2. Turn on the headlight switch. 3. Check the voltage at the following terminal wires of the DRL control unit connector. 0 B+: Battery positive voltage I Terminal I Voltage I 0 I I 45UOTX-151 4. If not as specified, repair wiring harness. (Flasher unit - DRL control unit) 5. If correct, replace the DRL control unit. F (GIB) H (GN) Step 5 1. Turn on the ignition switch. 2. Pull the parking brake lever more than one notch. 3. Check the voltage at terminal wire B (R) of the DRL con- trol unit connector. Cycles B+ and OV Cycles B+ and OV 4. If not as specified, go to Step 6. 5. If correct, replace the DRL control unit. T-75 B+: Battery positive voltage I Terminal Voltage B IR1 B+ Gartner Banana