1994 MAZDA MX-5 audio

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

T AUDIO Step 5 1. Check for proper tightness of the antenna mounting nut. 2. If the nut is loose, tighten it. 3. If the nut is tight, go to Step 6. u Step 6 1. Remove the audio unit. (Refer to page T-145.) 2. Check for proper connection of the antenna connector. 3. If necessary, repair or reconnect it. 4. If the connection if OK, replace the audio unit.. Gartner Banana

AUDIO T 1 Symptom: Poor sound quality (Cassette tape player) I u Possible cause Damaged cassette tape Damaged speaker Damaged audio unit Dirty heads and pinchroller 45UOTX-250 Step 1 1. Play a known good tape, and check the sound quality. 2. If sound quality is normal, the previous tape is defective. The system is OK. 3. If sound quality is still poor, go to Step 2. Step 2 1. Check for oxide or dirt on the head, capstan, and pinch- roller. 2. If oxide or dirt is found, clean the parts by using a head cleaner (commercially available). 3. If there is no oxide or dirt, go to Step 3. Step 3 1. Check for damage to the speakers. 2. Check for proper connection of the speaker connectors. 3. Disconnect all speaker connectors, and measure resis- tance of each speaker. Resistance: 4Q 4. If a speaker has incorrect resistance or is damaged, re- place it. 5. If the speakers are OK, go to Step 4. Step 4 1. Compare sound quality with that of another vehicle that has the same type of audio system. 2. If the sound quality is inferior to the other unit, replace the audio unit. Gartner Banana

T AUDIO Symptom: Cassette tape will not load Possible cause Damaged cassette tape Damaged audio unit Step 1 1. Check if a known good cassette tape will load. 2. If the tape loads, the previous tape is defective. The sys- tem is OK. 3. If the tape will not load, go to Step 2. I I 9MUOTX-384 s=Jh Step 2 1. Check if radio operation is OK. 2. If radio operation is OK, replace the audio unit. 3. If the radio do not operate, there is a defect in the power supply circuit. Gartner Banana

AUDIO Symptom: Cassette tape will not play i/ Possible cause Damaged cassette tape Damaged audio unit 45UOTX-252 Step 1 1. Check if cassette tape will load. 2. If cassette tape will not load, see "Cassette tape will load." (Refer to page T-134.) 3. If cassette tape loads, go to Step 2. not Step 2 1. Play a known good tape, and check the sound quality. 2. If the sound quality is normal, the previous tape is defec- tive. The system is OK. 3. If the sound quality is still poor, go to Step 3. Step 3 1. Check for oxide or dirt on the head, capstan, and pinch- roller. 2. If oxide or dirt is found, clean the parts by using a head cleaner (commercially available). 3. If after cleaning the parts, the tape still does not play, re- fer to "Speaker(s) do not operate" (Refer to page T-125, 127) or "No sound can be heard." (Refer to page T-137.) Gartner Banana