wiring MAZDA MX-5 1994 Owners Manual

T WARNING LIGHT AND SENDER UNIT Remedy 1. Disconnect the timer and buzzer unit connector. 2. Turn the ignition switch ON, and verify that the seat belt warning light illuminates. I Warning light illuminates I Action Seat Belt Warning Light The seat belt warning light is controlled by the timer and buzzer unit. 1 Reolace timer and buzzer unit I Symptom: Seat belt warning light remains on six seconds after ignition switch is turned on. (Timer function does not operate.) I Yes Repair wiring harness (Instrument cluster - Timer and buzzer unit) I d 1 Symptom: Seat belt warning light does not illuminate when ignition switch is first turned on. I 45UOTX-070 Step 1 1. Ground terminal J of the timer and buzzer unit connector. 2. Turn the ignition switch ON, and verify that the seat belt warning light illuminates. 1 Warning light illuminates I Action I Step 2 1. Ground terminal D of the timer and buzzer unit connec- tor. 2. Turn the ianition switch ON. and verifv that the seat belt No Yes warning light illuminates. . Go to Step 2 Repair wiring harness (Timer and buzzer unit - GND) Warning light Illuminates Action Replace timer and buzzer unit Check bulb of seat belt warning light If bulb is OK, repair wiring harness (Instrument cluster - Timer and buzzer unit) Gartner Banana

WARNING LIGHT AND SENDER UNIT T OHMMETER Washer Level Indicator lnspection 1. Disconnect the connector from the washer level sensor. 2. Jump terminal-wire L (harness side) to a body ground. 3. Start the engine and check that the WASHER indicator illuminates. 4. If there is no illumination, check the bulb, wiring harness, and sensor. Replace or repair as necessary. Washer Level Sensor lnspection 1. Connect the sensor connector (sensor side) to an ohm- meter. 2. Move the sensor float up and down. 3. Verify that there is continuity when the float is at the low- est point. BRAKE FLUID LEVEL SENSOR lnspection 1. Check for continuity of the sensor. 2. If continuity is not as specified, replace the level sensor. Float level Below MIN Above MIN BUCKLE SWITCt Continuity Yes No OHMMETER -1 PARKING BRAKE SWITCH lnspection 1. Disconnect the parking brake switch connector. 2. Check for continuity between the switch connector and ground. I Lever I Continuity I 3. If continuity is not as specified, adjust or replace the parking brake switch. (Refer to section P.) Pulled one notch Released BUCKLE SWITCH lnspection 1. Disconnect the buckle switch connector 2. Check for continuity of the switch. Yes No Seat belt I Continuity Seat belt buckled Seat belt unbuckled No Yes 3. If continuity is not as specified, replace the buckle switch. Gartner Banana

LIGHTING SYSTEM T LAY Step 2 1. Turn the headlight switch ON. 2. Measure the voltage at the following terminal-wires of the headlight relay connector. B+: Battery positive voltage Other Action Go to Step 3 Check B terminal Go to Step 6 Check A terminal Check D terminal Repair wirring harness Repair wiring harness (HEAD 30A - Headliclht relav) I Step 3 1. Turn the headlight switch ON. 2. Measure the voltaae at the followinn terminal-wires of - the headlight switch connector. B+: Battery positive voltage Termlnal I Switch position I Voltage / Action I Check I terminal switch) Low beam G B+ Other - Go to Step 4 Replace combination switch High beam Step 4 1. Check the headlight bulbs. 2. If a bulb is burned, replace it. 3. If the bulbs are OK, go to Step 5. B+ Other Go to Step 4 Replace combination switch Gartner Banana

T LIGHTING SYSTEM Step 5 1. Disconnect the headlight connectors. 2. Turn the headlight switch on. 3. Measure the voltage at the following terminal wires. d B+: Battery positive voltage Switch position Low beam High beam Voltage B+ Other B+ Action Repair wiring harness (Retractable headlight - GND) Repair wiring harness (Combination switch - Retract- able headlight) Repair wiring harness (Retractable headlight - GND) 1. ?urn the headlight switch on. 2. Measure the voltage at the following terminal wires of the combination switch connector. B+: Battery positive voltage Other Terminal Repair wiring harness (Combination switch - Retract- able headlight) Voltage Action B+ Check D terminal Repair wiring harness (Retractable headlight relay - Com- bination switch) D B+ Other Repair wiring harness (Combination switch - GND) Replace combination switch Gartner Banana

LIGHTING SYSTEM T I Symptom: Headlight does not illuminate (Right or left). I Step 1 1. Check the headlight bulbs. 2. If a bulb is burned, replace it. 3. If the bulbs are OK, go to Step 2. Step 2 1. Disconnect the headlight connector of the faulty side. 2. Turn the headlight switch on. 3. Measure the voltage at the following terminal wires. B+: Battery positive voltage Other IB(FVW) Highbeam Action Repair wiring harness (Retractable headlight - GND) Repair wiring harness (Combination switch - Retract- able headlight) Repair wiring harness (Retractable headlight - GND) Repair wiring harness (Combination switch - Retract- able headlight) Gartner Banana

T LIGHTING SYSTEM I Symptom: Retractable headlight actuators do not operate (Both sides). I Activate the headlight switch and retractor switch and follow the approximate action. d Switch I Headlight switch ON / 'RECTOR Retractor rnotor(s) operate Retractor switch ON Step 1 1. Check RETRACTOR 30A and HEAD 30A fuses in the main fuse block. 2. If a fuse is burned, replace it. Check and repair the wire harness, if necessary. 3. If the fuses are OK, go to Step 2. Actlon Yes No Step 2 1. Disconnect the negative battery cable. 2. Retract the headlights fully by using the manual knobs. 3. Disconnect the retractable headlight actuator connec- tors. 4. Reconnect the negative battery cable. 5. Turn on the headlight switch and retractor switch. 6. Measure the voltage at the following terminal wires of the retractable headlight actuator connectors. Begin troubleshooting from Step 5 Next, turn ON retractor switch 45UOTX-087 Yes No B+: Batterv ~ositive voltage Begin troubleshooting from Step 4 Begin troubleshooting from Step 1 . . - Step 3 1. Disconnect the retractable headlight actuator connec- tors. 2. Check for continuity between the A terminal wire of the retractable headlight actuator connectors and ground. Retractable headlight actuator Left and Right I~ontinui~l headlight actuator Action Voltage (RN) Repair wiring harness (Retractable headlight actuator - GND) Left and Right Check retractable headlight actuator (Refer to oaon T-51) Action B+ Other Go to Step 3 Go to Step 4 Gartner Banana

LIGHTING SYSTEM T Step 4 1. Turn off the retractor switch. 2. Turn on the headlight switch. 3. Measure the voltage at the following terminal wires of the retractable headlight relay connector. B+: Battery positive voltage Terminal F Voltage B+ Repair wiring harness I Other / (Headlight relay - Retractable headlight relay) Action Check B terminal Other B+ Go to Step 5 Check D terminal Repair wiring harness IGIB+l (Retractor relay - Retractable headlight actuator) I 1 I Other I Replace retractable headlight relay 1 Step 5 Measure the voltage at the terminal wires of the retractor switch. B+ Other B+: Battery positive voltage Repair wiring harness (Retractable headlight relay - GND) Check G terminal 1 I I B+ I Check B and D terminal - - - Repair wiring harness 30A - Retractor I Termlanl Voltage Retractor switch B(W) Action Repair wiring harness (Retractor switch - Retractable OFF B+/ headlight actuator) 1 Other Replace retractor switch D (RN) ON B+ Other Repair wiring harness (Retractor switch - Retractable headlight actuator) Re~lafX retractor switch Gartner Banana

T LIGHTING SYSTEM d I Symptom: Retractable headlight actuator does not operate (One side). 45UOTX-092 Step 1 1. Disconnect the negative battery cable. 2. Retract the inoperative headlight fully by using the manual knob. 3. Disconnect the retractable headlight actuator connector on the faulty side. 4. Reconnect the negative battery cable. 5. Turn on the headlight switch and retractor switch. 6. Check the voltage at the C terminal wire of the retract- able headlight actuator connector. B+: Battery positive voltage Voltage I Action 1 B+ Other Go to Step 2 Repair wiring harness (Retractable headlight relay - Retractable headlight actuator) Step 2 Check for continuity between the A terminal wire of the faulty retractable headlight actuator connector and ground. Continuity No Yes Action Repair wiring harness (Retractable headlight actuator - GND) Check retractable headlight actuator (Refer to page T-51) Gartner Banana

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

LIGHTING SYSTEM T u I Symptom: Stoplights does not illuminate (One only). 45UOTX-108 STOPLIGHT 'I HIGH-MOUNT STOPLIGHT Removal / Installation - -- 1. stoplight, High-mount stoplight 2. Remove and install as shown in the figure. Step 1 1. Check the stoplight bulb of the faulty side. 2. If a bulb is burned, replace it. 3. If the bulb is OK, go to Step 2. Step 2 Measure the voltage at the following terminal wires of the faulty rear combination ligjht connector. B+: Battery ~ositive voltaae -. - I Inspection I TernM I Voltage I condition Action - STOPLIGHT (LH AND RH) HIGH-MOUNT STOPLIGHT Brake pedal depressed F B+ Other B+ Other Check F terminal Repair wiring harness (Stoplight switch - Rear mrnbina- tion light) Repair wiring harness (Rear combination light - GND) Check for poor connection of con- nectors Gartner Banana