relay MAZDA MX-5 1994 Manual Online

Before beginning any service procedure. refer to section T of this manual for I air bag system service warnings and audio antitheft system alarm conditions . HEATER AND AIR CONDITIONER SYSTEMS ....................................... INDEX U- 2 ................................... HEATER U- 2 AIR CONDITIONER ......................... U- 3 TROUBLESHOOTING ......................... U- 4 CIRCUIT DIAGRAM ......................... U- 4 TROUBLESHOOTING GUIDE ................ U- 5 ..................................... HEATER U-15 ........................ STRUCTURAL VIEW U-15 HEATER UNIT .............................. U-16 BLOWER UNIT ............................. U-18 HEATER CONTROL UNIT .................... U-20 AIR CONDITIONER ........................... U-23 PREPARATION ............................. U-23 STRUCTURAL Vl EW ........................ U-23 SERVICE WARNINGS ....................... U-24 SERVICE CAUTIONS ........................ U-24 REFRIGERANT SYSTEM SERVICE PROCEDURE .............................. U-25 COOLING UNIT ............................. U-30 CONDENSER AND RECEIVER DRIER ........ U-33 REFRIGERANT LINES ....................... U-35 CONDENSER FAN .......................... U-36 AIC RELAY ................................. U-37 ................... CONDENSER FAN RELAY U-37 REFRIGERANT PRESSURE SWITCH ......... U-37 NC COMPRESSOR ......................... U-38 45U0Ux-001 Gartner Banana

INDEX u AIR CONDITIONER 1. Cooling unit 5. Condenser fan relay ................... Removal 1 Installation ......... page U-30 Inspection page U-37 Disassembly I Assembly ...... page U-31 6. A/C compressor 2. Condenser Removal 1 Installation ......... page U-38 ...... Removal I Installation ......... page U-33 Disassembly I Assembly page U-41 3. Receiver drier 7. Magnetic clutch Removal I Installation ......... page U-33 Disassembly 1 Assembly ...... page U-39 4. AIC relay Inspection ................... page U-37 Gartner Banana

Ix-ozl MAIN FUSE eLOCK MAIN AD FAN IX-071 L/Y (€1 \ G-01 G -01 FRONT (F) -A/C IAC) G-02 MAGNETIC CLUTCH (F) G-03 BLOHER WIT (F) 16-04 ?$WER&TVRE SNITCt .CONDENSOR FAN .HEATER AND AIR CONDITIONER I I '07 CONENSOR FAN (AC) G-08 REFRIGERANT PflESSURE SWITCH (AC) IG-09 A/C RELAY (ACI 16- 10 COMENSER FAN RELAY (AC) Gartner Banana

TROUBLESHOOTING u 7- Symptom: Magnetic clutch does not operate I Normal operation of magnetic clutch The PCME controls the operation of the condenser fan and magnetic clutch, depending on engine load. (Refer to section F.) The magnetic clutch is supplied with battery positive voltage as follows: 1. The ACS and fan switch are turned on. 2. The PCME receives a signal that the ACS and fan switch are on and creates a ground circuit. 3. The A/C relay is magnetized and the contact is closed. 4. Battery positive voltage is applied to the magnetic clutch and the clutch locks. WIPER 20A AD FAN 20A FUSE BLOCK MAIN FUSE BLOCK Step 1 1. Check the following fuses. I Fuse I Amperage I Location I I I . - I WIPER I 20A 1 In fuse block I I AD FAN I 20A 1 In main fuse block I 2. If the fuses are OK, go to Step 2. 3. If a fuse is burned, check for a short circuit in the harness before replacing it. Step 2 1. Run the engine at idle. 2. Turn on the ACS and fan switch. 3. Measure the voltage at the A terminal wire of the mag- netic clutch connector. B+: Battery positive voltage I Terminal I Voltage I Action 1 Step 3 1. Start the engine. 2. Turn on the fan switch and ACS. 3. Measure the voltage at terminal C and A of the A/C relay connector. B+: Batterv positive voltaae - -- A 1 Terminal I V0lta0e 1 Action I I C I Other I Repair wiring harness (AD FAN 20A fuse - AIC relay) I B+ Other I 1. -. B+ I GO to step 4 Replace magnetic clutch Go to Step 3 I A 1 Other I Repair wiring harness (WIPER 20A fuse - AIC relay) I Gartner Banana

u TROUBLESHOOTING Step 4 1. Remove the relay. 2. Apply battery positive voltage and check for continuity between the relay terminals. B+: Battery positive voltage 0---0 : Continuity I I I 45U0UX-013 3. If correct, repair wiring harness (AC relay - magnetic clutch). 4. If not as specified, replace the A/C relay. 1 0 10 I I I 2 1 B+ 1 GND 1 0 I Gartner Banana

TROUBLESHOOTING u Symptom: Condenser fan does not operate Normal operation of condenser fan The PCME controls the operation of the condenser fan and magnetic clutch, depending on engine load. (Refer to section F.) The condenser fan is supplied with battery positive voltage as follows: 1. The ACS and fan switch are turned on. 2. The PCME receives a signal that the ACS and fan switch are on and creates a ground circuit. 3. The A/C relay is magnetized and the contact is closed. 4. Battery positive voltage is applied to the condenser fan and the fan operates. Step 1 1. Turn the ignition switch to ON. 2. Measure the voltage at terminal A (B/Y) of the condenser fan connector. B+: Battery positive voltage Step 2 1. Disconnect the condenser fan connector. 2. Check for continuity between terminal B (B) of the con- denser fan connector and ground. Voltage B+ Other I GO to step 3 Action Go to Step 2 I continuity I Action I Step 3 1. Remove the condenser fan relay. 2. Apply battery positive voltage and check for continuity between the relay terminals. B+: Battery positive voltage Yes No Replace condenser fan Repair wiring harness (Condenser fan - GND) M: Continuity - - - 3. If correct, go to Step 4. 4. If not as specified, replace the condenser fan relay. 1 0 2 B+ Step 4 Check for continuity between terminal A (BN) of the con- denser fan connector and terminal C (BN) of the con- denser fan relay connector. I Continuity I Action 1 Repair wiring harness (Condenser fan relay - Fuse) B 0 GND I Repair wiring harness (Condenser fan - Condenser fan relay) I C 0 0 E 0 F 0 Gartner Banana

AIR CONDITIONER U AIR CONDITIONER PREPARATION i, SST I I c STRUCTURAL VIEW 00007-10331 Stopper, magnetic clutch 4992-02-020 Pressure plate remover For removal and installation of magnetic clutch For removal of pressure plate 1. Cooling unit 5. Condenser fan relay Removal I Installation ......... page U-30 Inspection ................... page U-37 Disassembly I Assembly ...... page U-31 6. AX: compressor 2. Condenser Removal I Installation ......... page U-38 Removal I Installation ......... page U-33 Disassembly I Assembly ...... page U-41 w 3. Receiver drier 7. Magnetic clutch Removal / Installation ......... page U-33 Disassembly / Assembly ...... page U-39 4. A/C relay Inspection ................... page U-37 Gartner Banana

AIR CONDITIONER REFRIGERANT PRESSURE SWITCH OPERATION 206 {2.1,30) 3,140 (32.0, 455) OFF ON n 230 {2.3,33) 2,550 (26.0,370) A/C RELAY Inspection 1. Remove the relay. 2. Apply battery positive voltage and check for continuity between terminals of the relay. B+: Battery positive voltage 3. If not as specified, replace the relay. CONDENSER FAN RELAY lnspection 1. Remove the relay. 2. Apply battery positive voltage and check for continuity between terminals of the relay. B+: Battery positive voltage 1 2 O--(): Continuity 3. If not as specified, replace the relay. 0 B+ 1 2 REFRIGERANT PRESSURE SWITCH lnspection If problems occur in the refrigerant system that cause ab- normally high pressure or abnormally low pressure, the pressure switch will cut power to the magnetic clutch to protect the mechanical components. If the pressure re- covers to within normal operating range, the power will be restored. These operating values are shown in the figure. kPa (kgf/cm2, psi) 35UOUX-020 1. Connect a manifold gauge set to the charging valve. 2. Verify that the high-pressure-side pressure is 230-2,550 kPa (2.3-26.0 kgf/cm2, 33-370 psi). 3. Disconnect the refrigerant pressure switch connector and check for continuity between the switch terminals. 4. If there is no continuity, replace the refrigerant pressure switch. 45UOUX-085 0 GND 0 B+ 0 0 GND 0 0 0 0 3 Gartner Banana

PICTORIAL INDEX WINDSHIELD WEQERS .ra..-.---.l-*-.l-.ru --I- HEAD LMP RE1 ftACT4tS FRONT Nn'l'lOiJ LMP! UYWIIIL. t - OOMl SUITCS &%MI 1 RELAYS 8 Ukll (WY) --- ---4.Iclllr LICERSE LAHPS E--- Gartner Banana

SECT ION NAME INDEX (my) - LO a NO * - ... - a 2-C03 2-E03 2-H03 2-403 2-KO3 2-1.03 2-CO4 2-E04 2-H04 2-104 2- JOG ?-KO4 2-M04 ?-NO4 9-CO4 ?-LO5 2-8 0% ?-KO5 ?-NO!, 7-CO6 ?*C47 i?-107 ?*f-d7 ?-GO I ?- 109 ,!-LO I Z-catj il- t. 0 a 2 .. f' fl g4 ?-GO9 ;,. JO9 ?-MQY ? il'j ? CII --- - - SEC .#I ---..- 0900 5000 5910 8030 5100 5103 $105 5110 5120 5170 5180 5230 5260 5310 5520 5539 5340 5370 5580 53 YO 5500 5570 55.10 5!>40 5560 55 "0 5588 5 IOU 5790 '; 19'. 5flOti !,bSB !J n c* u LlbIJ . ---..- - - --- SECfION NAME -----.- ------------------ ..--- KEY SETS FRONT BUNPER REAR EUHPER WINDOW HOULDING L COWL GRILLES HEAD LANPS HEAD LAHP RE T RACY ORS FRONT CONBINITION Lanes REAR COHBINATIOH LAHPS L ALENSE LAHPS BRNAMM3S REAR FIWISWER BONNET TRUNK LIB FWDNT PANELS FEIiDER P WHEEL APRON PANELS 3PCU L COWL PANELS SiUE PANELS {'!.OUR PANELS, FLCOR AYTACWHEHTS (HDCC GOVEAS 1 FLOOR AVYACHHEHTS DASHEOARD EOU IPMENI 5 nf VCR NttUD SPEEDOM TCW CADI.[; nt 1 ER CONPONE ws DASHBOAKU 6 WI LATLb PAKl S COHSOLC. VLUTILATOSI St.AI'S %CAI IC'ITS AIR OhC FblOlil li00k'$ F WLlh 'l !WOH Wt't:NAN I TUUHI 1)ouu IHlnS 1 WELAICL, PAW 1s - SEC * N( -----a 6110 6115 6 120 6130 6160 6190 6300 6330 6600 6610 661 1 6638 6635 6640 6600 6662 670U &7C 1 6707 6703 6784 6 ?i!U 6720 1 6730 6 760 ba20 6140 ~uen tB1U bVQU SECTION NAHE HEATER UNIT COMPONENTS HEATER CONTROLS COMPONENTS HEATER BL OWER COHPONENT S AIR CONDITIONER COMPRESSOR COHFONENTS (AIR CON DIT JlrNEiO COOLING UI\'TS (AIR COHDITIOHEW) WINDOW GLASSES SUNROOF SWITCHES C RFtAVS (ENGINE) DASHBOARD SWlTCHES COHBINATIOM SWITCH RELAYS L UNIT (BODY) DOOR SWITCH & HDRWS AUTO CRUISE CONTROL SYSTEH AUDIO SYSTEMS (RADIO & TAPE W. CK 1 AUDIO SYSTFffS (ANTENNA 6 SPEAK El?) NIP t He HARNESSES(FRON1 L REAR ) WlW iNG HARNESS CL.AHPS UtHaSH1EL.D W4SHER ANT1 LJCI BRAKE SYSTEH) WIHDSHIELU WASHER (AH71 LOCK BRAKE SYSTEM) UINUSHIELD WIPERS FRONT hEAD$Y TWIN & PIMY TRl n s FLOOR HATS L PAW QUARTER WINDOW L VRIHS LA I L Olr HI).. AUHAOd* I1 3 Gartner Banana