1994 MAZDA MX-5 Workshop Manual

J-2 I AUOIO SYSTEM (TYPE-3) HEADREST SPEAKER BOOY SONIC WCi%l SPEAKER OAIVER SIDE -01 AUOIO WIT (I) 114 1K 1N 1L tJ 1H IF ID 1s PASSENGER SIOE -1 J-02 AUTO LEVEL CONTROLLER (I1 2J 3 ZJA -05 OOOR SPEAKER J-06 HEADREST SPEAKER AND BOOY SONIC(R) IJ-O~ HEADREST SPEAKER AND BODY SONIC(F2) I J-a NETWORK LH (DR1) (WOOFER1 RH (OR21 -10 DOOR SPEAKER (TWEETER) LH (ORI) J-09 NETWORK RH (OR21 J-03 AUTO LEVEL CONiROLLER (I) 3[)3c%U J-04 DOOR SPEAKER (WOOFER) LH (OAl) I J-11 WOR SPEAKER (TWEETER) RH (OR21 J-12 AM10 WIT r&Tl 1J M5 4)- Gartner Banana

AUDIO T Symptom: Speaker(s) do not operate (Without headrest speakers.) I L/ Possible cause Antitheft system activated Damaged audio unit Open circuit in wiring harness Poor connection of connector Damaged speaker Step 1 Check if the antitheft system has been activated. Turn the ignition switch to ACC and note the display. - - - Display CODE flashes Step 2 1. Remove the audio unit. (Refer to page T-145.) 2. Check the connections of the ground wire and the short plug. 3. If a connection is poor or loose, repair or replace it. 4. If the connections are OK, go to Step 3. Action Deactive antitheft system (page T-120) and go to step 2 Err flashes Clock No indication Step 3 1. Turn the ignition switch to ACC. 2. Measure the voltage at the following terminal-wires of the audio unit connector. B+: Battery positive voltage Have audio unit changed at a Panasonic service company Go to Step 4 Go to Ste~ 2 Terminal I Voltage I Action I B+ I Check C (UR) terminal 1 I 1, - I B+ I Redace audio unit I 1- Check ROOM 10A fuse (UR) I Other 1 If ROOM 10A fuse is OK, repair wiring harness 1 . . Check CIGAR 15A fuse If CIGAR 15A fuse is OK, repair wiring harness (CIGAR 15A fuse - Audio unit) A I I (ROOM 10A fuse - Audio unit) - I I Other Gartner Banana

T AUDIO BALANCE CONTROL 45UOTX-24' Table 1 Step 4 Locate the faulty speaker(s) by using the balance control. 1. Turn the ignition switch to ACC. 2. Play a prerecorded tape, and set the volume to the cen- ..-, ter position. 3. Set the balance control as shown in Table 1. 4. Check operation of each speaker. 5. From results of Table 1 testing, go to the next step. maker I Balance I Left door I Left Speaker operates Yes Right door Yes Right Judgement Left door speaker circuit OK Next Step - Left door speaker circuit faulty Right door speaker circuit OK Step 5 1. Remove the faulty door speaker cover and speaker installation screws. 2. Check if the speaker is properly connected. 3. If necessary, repair or reconnect the connector. 4. If the connection is OK, go to Step 6. Step 5 - Right door speaker circuit faulty Step 6 1. Disconnect the connector from the suspected faulty speaker. 2. Measure resistance between terminals of the speaker. Resistance: 4R 3. If not as specified, replace the speaker. 4. If the resistance is OK, go to Step 7. Step 5 J OSUOTX-254 Gartner Banana

AUDIO T Step 7 1. Disconnect the audio unit connector (12-pin). 2. Check for continuity between the audio unit connector and door speaker connector. M (VY) 1 2-pin tc B (WG) 2-pin Right door N (L) 12-pin ++ A (RAN) 2-pin K (WG) 12-pin ++ B (WG) P-pin Left door L [WWI 124n tc A IWW) 241 Spaker 3. If correct, replace the audio unit. 4. If not as specified, repair the wiring. Audio connector rp Symptom: Speaker(s) do not operate (With headrest speakers.) I 'peaker I Continuity I connector Possible cause Antitheft system activated Damaged audio unit - Open circuit in wiring harness GROUND WIRE Poor connection of connector Damaged speaker Step 1 Check if the antitheft system has been activated. Turn the ignition switch to ACC and note the display. Display CODE flashes Step 2 1. Remove the audio unit. (Refer to page T-145.) 2. Check the connections of the ground wire and the short plug. 3. If a connection is poor or loose, repair or replace it. 4. If the connections are OK, go to Step 3. Action Deactive antitheft system (page T-120) and go to step 2 Err flashes Clock No indication Have audio unit changed at a Panasonic service company Go to Step 4 Go to Step 2 Gartner Banana

T AUDIO Step 3 1. Turn the ignition switch to ACC. 2. Measure the voltage at the following terminal-wires of the audio unit connector. d B+: Battery positive voltage Action 1 rerminal Voltage + Check C (UR) terminal I Check CIGAR 15A fuse If CIGAR 15A fuse is OK, repair wiring harness (CIGAR 15A fuse - Audio unit) I A (uB) I Other If ROOM 10A fuse is OK, repair wiring harness (ROOM 10A fuse - Audio unit) Step 4 Locate the faulty speaker(s) by using the headrest speaker volume, and balance control. 1. Turn the ignition switch to ACC. 2. Play a prerecorded tape, and set the volume to the ten- ter position. .- 3. Set the head restraint speaker volume, and balance controls as shown in Table 2. Check operation of each speaker. 4. From results of Table 2 testing, go to the next step. I BALANCE CONTROL 45UOTX-246 Table 2 Judgement I Next Step I Speaker Left door I Left I Min Head restraint Speaker Ispeaker volume / operates Left door speaker circuit OK - Left door speaker circuit faultv 1 Step 5 Right door speaker circuit OK - Rinht door weaker circuit faultv Ste~ 5 (driver seat) faultv Step 8 Right door Left headrest (Driver seat) ---- Right headrest speaker circuit - (driver seat) OK Right headrest speaker circuit (driver seat) faultv Step 8 Right - Right headrest (Driver seat) Left headrest speaker circuit Left headrest (Passenger seat) Min Max - Max Yes No Yes No Right headrest (Passenger seat) Max 1 Max Yes I (passenger seat) OK I Right headrest speaker circuit bassenaer seat) faultv Gartner Banana

AUDIO Step 5 1. Remove the faulty door speaker cover and speaker installation screws. 2. Check if the speaker is properly connected. 3. If necessary, repair or reconnect the connector 4. If the connection is OK, go to Step 6. Step 6 1. Disconnect the connector from the suspected faulty speaker. 2. Measure resistance between terminals of the speaker. Resistance: 4fi 3. If not as specified, replace the speaker. 4. If the resistance is OK, go to Step 7. Step 7 1. Disconnect the audio unit connector (1 2-pin). 2. Check for continuity between the audio unit connector and door speaker connector. Audio I 'paker I connector 'Peaker I Continuity I I connector 3. If correct, replace the audio unit. 4. If not as specified, repair the wiring. Right door Left door Step 8 1. Check if the headrest speaker connector is properly con- nected. 2. If necessary, repair or reconnect the connector. 3. If the connection is OK, go to Step 9. 05UOTX-262 I M (LIY) 12-pin * B (RIG) 2-pin N (L) 12-pin t, A (WW) 2-pin K (RIG) 12-pin * B (WG) 2-pin L (RMI) 12-pin u A (RAN) 2-pin Yes Yes Yes Yes Gartner Banana

T AUDIO Step 9 1. Disconnect the headrest speaker connector. 2. Measure resistance between terminals of the headrest speaker connector as shown. i/ 3. If not as specified, replace the speaker. 4. If the resistance is OK, go to Step 10. Terminal A-B C-D Step 10 1. Disconnect the audio unit connector (Spin). 2. Check for continuity between the audio unit connector and headrest speaker connector (&pin). Resistance 4n Audio I 'paller I connector 'Peaker 1 continuity I I connector I Right headrest 3. If correct, replace the audio unit. 4. If not as specified, repair the wiring. Left headrest H (LiW) 8-pin tt C (VW) win B (UO) 8-pin t, D (UO) &pin Yes Yes F (R/L) 8-pin +t B (WL) 6-pin A (WY) 8-pin t* A (WY) Gpin Yes Yes Gartner Banana

AUDIO T I Symptom: Poor sound quality or noise (Radio) 1 ,, Possible cause Damaged cassette tape Damaged speaker Damaged antenna Damaged audio unit Open circuit in wiring harness Poor connection of connector 45UOTX-245 Step 1 1. Tune to the strongest AM station using the automatic memory function. 2. If the automatic memory function does not operate, go to Step 4. 3. Compare sound quality with that of another vehicle that has the same type audio unit. 4. If the sound quality is inferior to the other unit, go to Step n L. 5. If the sound quality is the same as the other unit, the sys- tem is OK. Step 2 1. Play a known good cassette tape, and compare the sound quality with another vehicle that has the same type audio unit. 2. If the sound quality is inferior to the other unit, the mal- function may be in the speaker circuit. Go to Step 3. 3. If the sound quality is same as the other unit, the mal- function may be in the antenna circuit. Go to Step 4. Step 3 1. Check for damage to the speakers. 2. Check for proper connection of speaker connectors. 3. Disconnect the speaker connectors, and measure resis- tance of each speaker. Resistance: 452 4. If a speaker has incorrect resistance or is damaged, re- place it. 5. If the speakers are OK, replace the audio unit. Step 4 1. Check that there is no continuity (infinite ohms) between the mast antenna and a body ground. 2. If there is continuity, replace the antenna. 3. If there is no continuity, go to Step 5. Gartner Banana