1994 MAZDA MX-5 Workshop Manual

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

REAR WINDOW DEFROSTER T BATTERY POSITIVE VOLTAGE 45UOTX-18C -- FAULTY PORTION OV BATTERY POSITIVE VOLTAGE 45UOTX-18; Rear Window Defroster Switch (Refer to section U.) Rear Window Defroster Filament 1. Turn the rear window defroster switch ON. 2. Connect the (+) terminal of a voltmeter to the center of each filament and the (-) terminal to the body. The stan- dard voltage at the center of each filament is approx. 6V. If the meter indication is high, there is a short circuit be- tween the center and the grounded side of the filament. If the indication is low or zero, the fault is between the center and positive side. REPAIRING FILAMENT Caution Use only paint thinner or ethyl alcohol for clean- ing. Other solvents can damage the surrounding filament. 1. Use paint thinner or ethyl alcohol to clean the damage section of the filament. 2. Apply tape to both sides of the damaged section of fila- ment. 3. Using a small brush or marking pen, apply silver paint (part no. 2835 77 600) or equivalent to the damaged sec- tion. 4. Use a blow dryer heated to 60°C (140°F) for 30 minutes or let the paint set for 24 hours at 20°C (68°F) to let it dry completely. Do not use the rear window defroster until the paint is dry. Gartner Banana

T CRUISE CONTROL SYSTEM CRUISE CONTROL SYSTEM STRUCTURAL VIEW 1. Cruise control unit 2. Cruise actuator 3. Actuator cable 4. ParkINeutral switch 5. Brake switch 6. Cruise control main switch 7. Cruise control switch 8. Clutch switch Gartner Banana

CRUISE CONTROL SYSTEM T CIRCUIT DIAGRAM 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

CRUISE CONTROL SYSTEM B+: Battery Dositive voltage erminall Win color . . .. Action Connected to Cruise actuator Cruise actuator Test condition Main switch OFF Main switch ON Cruise A\actuator Specification Main switch OFF Main switch ON PCMT OV 9V Main switch OFF . Main switch ON Brake switch Go to Step 8 OV . 9V Ignition switch OFF lanition switch ON ParklNeutral switch Cruise control Main switch ON switch (Set switch and coast switch) Check main switch OV 9V - Brake pedal depressed Brake ~edal released Clutch switch Check main switch OV B+ Shift to "N" or "P" range Shift to other ranae Go to section K OV 9V Clutch pedal depressed Clutch pedal released Stoplight switch Go to Step 4 OV 5V Cruise control switch (Resume switch and accel switch) speed I While rotating rear tires I beMeenM,, sor Run I GO to Step 9 Go to section K OV B+ Brake pedal depressed Brake pedal released Cruise actuator I I I Battery 1 Constant I B+ I Repair wiring harness Go to Step 5 Main switch ON While turning resume switch after main switch ON B+ OV Main switch OFF Step 4 - Inspection of brake switch 1. Disconnect the brake switch connector. 2. Check for continuity between terminals of the switch. Go to Step 7 B+ OV OV GND 1 Constant Pedal position Go to Step 6 OV I Repair wiring harness Terminal A B 1 I Main switch ON 9V 45UOTX-19 Go to Step 8 3. If not as specified, replace the brake switch. 4. If the switch is OK, repair the wiring harness (fuse - brake switch - control unit). Pedal released Pedal depressed M: Continuity 0 0 Gartner Banana

T CRUISE CONTROL SYSTEM ~~UOTX-195 3. If not as specified, replace the clutch switch. 4. If the switch is OK, repair the wiring harness (fuse - clutch switch - control unit). w B A CRUISE CONTROL UNIT I Step 5 - lnspection of clutch switch 1. Disconnect the clutch switch connector. 2. Check for continuity between terminals of the switch. I RESUMUACCEL I 0 I 0 I m: Continuity Step 6 - lnspection of cruise control switch 1. Remove the knee protector and disconnect the com- bination switch connector. 2. Check for continuity between terminals of the combina- tion switch connector. ./ 3. If not as specified, replace the cruise control switch. 4. If the switch is OK, repair the wiring harness (cruise con- trol switch - control unit). Pedal position Pedal released Pedal depressed Switch Step 7 - lnspection of stoplight switch 1. Disconnect the stoplight switch. 2. Check for continuity between terminals of the switch. W: Continuity Terminal Terminal A 0 SE Pedal position 3. If not as specified, replace the stoplight switch. 4. If the switch is OK, repair the wiring harness (cruise con- trol unit - stoplight switch). B 0 RE I E Terminal A B i Pedal released Pedal depressed m: Continuity 4 0 0 Gartner Banana

CRUISE CONTROL SYSTEM Step 8 - lnspection of actuator 1. Measure the cruise actuator solenoid resistance by us- ing an ohmmeter. Check terminals C-A 2. If not as soecified. redace the actuator. Resistance C-B C-D 3. If continuiiv is OK: ad to Ster, 84. Approx. 25 to 55R 4. ~isconne4 the actiator cabie from the accelerator ped- al. 5. Run the engine at idle speed. 6. Apply battery positive voltage to the following terminals, and check actuator operation. B+: Batterv aositive voltaae I Order 1 2 7. If not as specified, replace the actuator. Terminal condition AlBlClD 3 4 Step 9 - lnspection of vehicle speed sensor 1. Remove the instrument cluster. 2. Check for continuity between terminals 2D and 2F while rotating the speedometer cable. 3. If there are not four pulses per shaft rotation, replace the vehicle speed sensor. (Refer to page T-32.) 4. If there are four pulses per rotation, check the wiring har- ness. (instrument cluster - control unit). 5. If the wiring is OK, replace the cruise control unit. Operation of control cable GND GND GND - GND - - B+ B+ B+ - GND GND Pull Hold - - Extend Release Gartner Banana