wiring MAZDA MX-5 1994 Workshop Manual

T AUDIO Symptom: Some speakers do not operate 1 Possible cause Damaged speaker Damaged audio unit Damaged DIN cord Open or short circuit in wiring harness Poor connection of connector Open or short circuit in DIN cord 45UOTX-260 Step 1 1. Turn the ignition switch to ACC. 2. Turn the audio system power to ON. Play a recorded tape and set the volume at an appropriate level. 3. Verify speaker operation with the balance, treble, bass, and fader knobs in the positions indicated in Table 1. 4. If not as specified in Table 1, refer to Table 2 and continue troubleshooting at the step corresponding to the faulty speaker. 35UOTX-082 Table 1 1 Speaker Balance I Treble I Left door (woofer) I Right I ( Right door (woofer) I I Left door (tweeter) I Right I Right door (tweeter) Right Driver-side left headrest Right . I Passenger-side left headrest I Right I Driver-side right headrest Left Bass Passenger-side right headrest Right Left Fader I Speaker operates I Yes Right 1-1 I No Yes I Left Yes Table 2 Gartner Banana

AUDIO T Step 2 1. Remove the door speaker (woofer). (Refer to page T-146.) 2. Make sure the speaker is properly connected. 3, If the connections are OK, go to Step 3. 4. If a connection is poor, repair it. Step 3 1. Disconnect the connector from the suspected faulty door speaker. 2. Measure the resistance between the terminals of the door speaker (woofer). Step 4 1. Remove the audio unit. (Refer to page T-145.) 2. Make sure the audio unit connectors are properly con- Resistance 4Q Other nected. 3. If the connections are OK. ao to Step 5. Action Go to Step 4 Replace speaker 4. If a connection is poor, rep& it. 1. 6heck for continuity between the AM-FM radio unit con- nector (1 2-pin) and the door speaker (woofer) connec- tor (2-pin). Radio r 'Laker I connector I connector Right door 2. If correct, replace the AM-FM radio unit. 3. If not as specified, repair the wiring. Left door ~ ~ I M ((VV 12-pin tr B (WG) 2-pin N (L) 12-pin +t A (RMI) 2-pin Yes Yes K (RIG) 12-pin tr B (RIG) 2-pin L (WW) 12-pin o A (RNV) 2-pin Yes Yes Gartner Banana

T AUDIO Step 6 1. Remove the door speaker (tweeter). (Refer to page T-146.) 2. Make sure the speaker is properly connected. 3. If the connections are OK, go to Step 7. 4. If a connection is poor, repair it. Step 7 1. Disconnect the connector from the suspected faulty door speaker. 2. Measure the resistance between the terminals of the door speaker (tweeter). Step 8 1. Remove the audio unit. (Refer to page T-145.) 2. Make sure the audio unit connectors are properly con- nected. 3. If the connections are OK, go to Step 9. 4. If a connection is poor, repair it. Resistance 9R Other Step 9 1. Check for continuity between the network connector (4-pin) and the door speaker (tweeter) connector (2-pin). Action Go to Step 8 Replace speaker Network I 'paller I connector 'peaker I Continuity I I connector 2. If correct, go to Step 10. 3. If not as specified, repair the wiring. Right door Left door I C (UR) &pin tt A (UR) 2-pin D (BIL) &pin tt B (BIL) 2-pin C (UR) &pin tt A (UR) 2-pin D (BIL) 4-pin tt B (BIL) 2-pin Yes Yes Yes Yes Gartner Banana

AUDIO T Step 10 1. Check for continuity between the network connector (4-pin) and the AM-FM radio unit connecter (12-pin). Network I 'peaker I connector 'Waker 1 Continuity I I connector I I 35UOTX-093 2. If correct, redace the network. Right door Left door 3. If not as specified, repair the wiring. Step 11 1. Remove the headrest speaker. (Refer to page T-147.) 2. Make sure the speaker is properly connected. 3. If the connections are OK, go to Step 12. 4. If a connection is poor, repair it. I A (WG) 4-pin t, M (VY) 12-pin B (W) 4-pin ++ N (L) 12-pin A (WG) *in ++ K (WG) 1 2-ph B (WW) 4-pin tt L (WW) 1 P-pin Step 12 1. Disconnect the headrest speaker connector. 2. Measure the resistance between the terminals of the headrest speaker connector. Yes Yes Yes Yes Resistance Actlon 8Q Go to Step 13 Step 13 1. Remove the audio unit. (Refer to page T-145.) 2. Make sure the audio unit connector and DIN cord are properly connected. 3. If the connections are OK, go to Step 14. 4. If a connection is poor, repair it. Gartner Banana

T AUDIO Step 14 1. Turn the ignition switch to ACC. 2. Measure the voltage at terminal C (UB) of the auto level controller connector (&pin). .J B+: Battery positive voltage I voltage Action Step 15 1. Disconnect the auto level controller DIN cord (&pin). 2. Measure the voltage at terminal 2 of the DIN cord. B+ Other Go to Step 15 Repair wiring harness CIGAR fuse - Auto level controller B+: Battery positive voltage Step 16 1. Check for continuity between the auto level controller connector (&pin) and the headrest speaker and body- sonic connector (&pin). Voltage B+ Other Action Go to Step 16 Replace AMFM radio unit 2. If correct, replace the auto level controller. 3. If not as specified, repair the wiring. I Speaker Right headrest Left headrest ALC I 'peaker connector connector H (VW) 8-pin +t C (LMI) 6-pin B (UO) &pin ++ D (LO) 6-pin F (RIL) &pin o B (RIL) Gpin A (W) &pin o A (W) 6-pin continuity Yes Yes Yes Yes .- / Gartner Banana

AUDIO T Symptom: Bodysonic will not play Possible cause Damaged bodysonic Damaged audio unit Damaged DIN cord Open or short circuit in wiring harness Poor connection of connector Open or short circuit in DIN cord 45UOTX-269 Step 1 1. Remove the audio unit. (Refer to page T-145.) 2. Make sure the audio unit connector and DIN cord are properly connected. 3. If the connections are OK, go to Step 2. 4. If a connection is poor, repair it. Step 2 1. TI~ the ignition switch to ACC. .. .-... 2. Measure fhe voltage at terminal C (UB) of the auto level controller connector (8-pin). B+: Battery positive voltage Step 3 1. Disconnect the auto level controller DIN cord (6-pin). Voltage B+ Other 2. Measure the voltage at terminal 2 of the DIN cord. Action Go to Ste~ 3 J Repair wiring harness (CIGAR fuse - Auto level controller) B+: Batterv ~ositlve voltage I Other I Replace AMaFM radio unit . . - Step 4 1. Make sure headrest speaker and bodysonic connectors are properly connected. 2. If the connections are OK, go to Step 5. 3. If a connection is poor, repair it. Voltage B+ Action Go to Stea 4 Gartner Banana

AUDIO Step 5 1. Disconnect the connector from the suspected faulty headrest speaker and bodysonic. 2. Measure the resistance between the terminals E(G) and w F(G/B) of the headrest speaker and bodysonic connec- tor. I Other I Replace bodysonic I Resistance Step 6 1. Check for continuity between the auto level controller connector (4-pin) and the headrest speaker and body- sonic connector (&pin). Action 1 !::gg 1 continuity I 'peaker I connector I 8!2 I GO to Ste~ 4 I -- ~~ B (RAW) 4-pin ++ F (LN) win Driver-side I A (WB) 4-pin ++ E (UB) 6-pin I Yes Passenger-side 2. If the wiring is OK, replace the auto level controller. 3. If not as specified, repair the wiring. I D (W) 4-pin ++ F (WW) win C (UB) 4-pin +t E (RIB) 6-pin Yes Gartner Banana

AUDIO Inspection c Fuse ness. ml JHFDB If the antenna fails to raise or lower, make the following checks: 1. Check the antenna fuse (10A). 2. Replace fuse after checking and repairing wiring har- Power antenna 1. Check for continuity between the terminals of the power antenna relay. If there is no continuity, replace the relay. Terminal I M: Continuity 2. If the antenna does not function even though there is continuity, the problem may be either in the wiring har- ness or in the audio component assembly. 3. Apply battery positive voltage to the terminals and check the operation. I I A 1 B 1 DOWN I Function of antenna UP Battery Pos. D Neg. A Gartner Banana

AUDIO T INSPECTION Type 1 Door Speakers 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. Headrest Speakers 1. Disconnect the headrest speaker connector. 2. Measure resistance between the terminals of the head- rest speaker connector as shown. I Terminal I Resistance I 3. If not as specified, replace the speaker. A-B C-D Type 2 Door Speakers 1. Disconnect the connector from the suspected faulty door speaker. 2. Measure the resistance between the terminals of the speaker. 4R I I Woofer I 452 1 Speaker type 3. If not as specified, replace the door speaker. Resistance Headrest speakers 1. Disconnect the headrest speaker connector. 2. Measure the resistance between the terminals of the headrest speaker. Tweeter I 9~ Resistance: 851 3. If not as specified, replace the headrest speaker. Bodysonic 1. Disconnect the headrest speaker and bodysonic con- nector. 2. Measure the resistance between the terminals of the headrest speaker and bodysonic connector. Resistance: 8R 3. If not specified, replace the bodysonic or repair wiring harness. Gartner Banana

SRS AIR BAG SYSTEM SYSTEM DIAGRAM PASSENGER-SIDE S-SENSOR AIR BAG MODULE I IG1 B+ HORN RELAY CLOCK SPRING BACK-UP BATTERY I AIR BAG SYSTEM WARNING LIGHT SENSOR -7 System Operation During collision When either of the D-sensors and the S-sensor are activated (closed) simultaneously by shock of a colli- sion, the circuit to the inflator is completed. The inflator creates nitrogen gas and the air bag is deployed. The air bag vents the nitrogen gas from the vent hole on the back side of the bag to reduce shock to the driver and to allow easier exit from the vehicle. During normal condition and malfunction The diagnostic module constantly monitors the components and wiring of the air bag system for malfunc- tion, open circuits, and short circuits. .J If a malfunction is detected, the diagnostic module illuminates or flashes the warning light. In the case of a short circuit in the sensors or sensor harnesses, the diagnostic module activates the warning light and shuts down the system to prevent accidental deployment of the air bag. Gartner Banana