1994 MAZDA MX-5 light

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

T LIGHTING SYSTEM r REAR COMBINATION LIGHT Disassembly 1. Use a hot air blower to soften the "hot melt" (bonding Turn signal switch (in combination switch) Front turn signal lights agent) around the lens. Step 6 1. Disconnect the parking brake switch connector. 2. Check for continuity between the terminal of the switch and ground. u T-19 T-64 2. Remove the lens from the light rear of the lens with a hammer I Parking brake lever Pulled one notch Released 45U0TX-153 4. If correct, repair wirring harness. (Parking brake switch - DRL control unit) Removal 1 Installation Refer to the following pages: housing by pushing the handle or round bar. Continuity Yes No Item Headlight switch (in combination switch) Hazard warning switch 3. Remove the old hot melt from the light housing. 3. If not as specified, adjust or replace the parking brake switch. Reference page T-19 T-21 Gartner Banana

LIGHTING SYSTEM T Assembly 1. If new hot melt is used, put Uni-sealer (8531 77 739) adhesive in the light housing groove. 2. Fit the new lens onto the light housing. Press the lens firmly so that it will adhere. 3. Allow the sealer to dry for about one hour. 4. Immerse the combination light in water to check for leaks. 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

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