wiring MAZDA MX-5 1994 Workshop Manual

SRS AIR BAG SYSTEM SERVICE WARNINGS Component Disassembly Disassembling and reassembling the components of the air bag system can render the system inopera- tive, which may result in serious injury or death in the event of an accident. Do not disassemble any air bag system components. Wiring Harness Repair Incorrectly repairing an air bag system wiring har- ness can accidently deploy the air bag, which can cause serious injury. If a problem is found in the sys- tem wiring, replace the wiring harness. Do not try to repair it. Air Bag Module Inspection Inspecting the air bag module with an ohmmeter can deploy the air bag, which can cause serious injury. Do not use an ohmmeter to inspect the air bag mod- ule. Air Bag Module Handling A live (undeployed) air bag may accidently deploy when it is handled and cause serious injury. When carrying a live air bag module, point the trim cover away from your body to lessen the chance of injury in case it deploys. A live air bag placed face down on a surface is dan- gerous. If the air bag deploys, the motion of the mod- ule can cause serious injury. Always face the trim cover up to reduce the motion of the module in case it accidently deploys. Gartner Banana

T SRS AIR BAG SYSTEM I Flowchart No1 I Symptom I Air bag warning light remains ON I Possible cause Poor connection of diagnostic module connector Defective diagnostic module 0 Defective wiring harness CONNECTOR Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Step 2 1. Verify that the diagnostic module connector is securely connected to the diagnostic module. 2. Verify that the shorting bar is in the fully retracted posi- tion. 3. If the connector and shorting bar are OK, go to step 3. Step 3 1. Disconnect the diagnostic module connector. 2. Remove the shorting bar from the diagnostic module connector. 3. Check the air bag system warning light. I Llght condltlon 1 Action I I I Illuminate I Repair wiring harness (Instrument cluster - Diagnostic module) I Not illuminate Replace diagnostic module (Refer to page T-208) Gartner Banana

SRS AIR BAG SYSTEM T Possible cause Defective diagnostic module Defective S-sensor Defective wiring harness Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Service Code 12 Flowchart No.2 Step 2 Check the EGI IJN fuse. Symptom I Fuse I Action I Step 3 1. Disconnect the diagnostic module connector. 2. Connect the negative battery cable. 3. Measure the voltage at terminal 1 L (WIG) of the diagnos- tic module connector. OK Burnt B+: Battery positive voltage Voltage Action I Go to Step 3 Go to Step 4 Step 4 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1L (WIG) of the diagnostic module connector and ground. B+ Other Replace diagnostic module Repair wiring harness (EGI INJ fuse - Diagnostic module) I NO I GO to Step 5 I Continuity Yes Step 5 Check for continuity between terminal 1H (GIB) of the diagnostic module connector and ground. Continuity I Action Action Repair wiring harness (EGI INJ fuse - Diag- nostic module) and replace the fuse Yes ( Go to Step 6 No Replace diagnostic module (Refer to page T-208) Gartner Banana

SRS AIR BAG SYSTEM Step 6 1. Disconnect the S-sensor connector. 2. Check for continuity between terminal 1 H (GIB) of the diagnostic module connector and ground. I No I Replace wiring harness I Continuity Yes Action Replace S-sensor (Refer to page T-213) Gartner Banana

SRS AIR BAG SYSTEM L Possible cause Defective air bag module(s) Defective clock spring Defective S-sensor Defective D-sensor Defective diagnostic Defective wiring harness Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Service Code 13 Flowchart No.3 Step 2 1. Connect the negative battery cable. 2. Turn the ignition switch ON and check the service code. Symptom Step 3 Service code 13 Other Warning Handling the air bag module improperly can acci- dently deploy the air bag, which may seriously in- jure you. Read SERVICE WARNINGS, page T-159, before handling the air bag module. Action Go to Step 5 Go to Step 3 1. Turn the ignition switch to LOCK. 2. Disconnect the negative battery cable. 3. Remove the driver-side air bag module. (Refer to page T-206.) 4. Connect the blue and orange clock spring connectors. 5. Connect the negative battery cable. 6. Turn the ignition switch to ON and check the service code. I Service code I Action 1 13 Other Replace combination switch (Refer to page T-19) Go to step 4 Gartner Banana

T SRS AIR BAG SYSTEM Step 4 1. Turn the ignition switch to LOCK. 2. Disconnect the negative battery cable. 3. Connect the blue and orange passenger-side air bag d module connectors. 4. Connect the negative battery cable. 5. Turn the ignition switch to ON and check the service code. I Service code I Action I I 13 Replace passenger-side air bag module (Refer to page T-207) I I mer I Replace driver-side air bag module (Refer to ~aae T-2061 I No I Go to Step 6 Step 5 1. Turn the ignition switch to LOCK. 2. Disconnect the diagnostic module connectors. 3. Check for continuity between terminal 2F (GY) of the diagnostic module connector and ground. Step 6 Check for continuity between terminal 2G (GN) of the diagnostic module connector and ground. I Continuity Action d Continuity Yes Step 7 Check for continuity between terminal 20 (GNV) of the diagnostic module connector and ground. Action Replace wiring harness Yes No Replace wiring harness Go to Step 7 I NO I GO to Step 9 ~d Continuity Yes Action Go to Step 8 Gartner Banana

SRS AIR BAG SYSTEM Step 8 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between terminal C of the S-sensor and ground. Continuity Action 1 Yes No Step 10 1. Disconnect the suspect sensor connector. 2. Measure the resistance between terminal A of the sen- sor and ground. Replace S-sensor (Refer to page T-213) Replace wiring harness Step 9 Measure the resistance between terminal 1 C (BRIG), 1 A (BRIR), and 2L (BRIB) of the diagnostic module connec- tor and ground. Resistance k&2 Other Other I Replace sensor I Action Replace diagnostic module (Refer to page T-208) Suspect sensor: Terminal 1 C -+ right D-sensor Terminal 1 A -+ Center D-sensor Terminal 2L -+ left D-sensor Go to Step 10 Measure 1.18 kn Action Replace wiring harness Gartner Banana

T SRS AIR BAG SYSTEM Possible cause i/ Defective S-sensor Defective wiring harness Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Service Code 21 Flowchart No.4 Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 E (RIB) of the Symptom connector and ground. Step 3 1. -Disconnect the orange and blue S-sensor connector. 2. Check for continuity between terminal A of the S-sensor and ground. I Continuity I Action Continuity Yes No Action Replace diagnostic module (Refer to page T-208) Go to Step 3 Yes No Replace wiring harness Replace S-sensor (Refer to page T-213) Gartner Banana

SRS AIR BAG SYSTEM T Flowchart N0.5 I Symptom I Service Code 22 Possible cause Defective wiring harness Defective S-sensor Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 H (GIB) and 2D (GMI) of the diagnostic module connector. Continuity Yes Step 3 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between terminal B and D of the S- sensor. Continuity I Action I Action Go to Step 3 I No Replace diagnostic module (Refer to page T-208) Yes No Replace S-sensor (Refer to page T-213) Replace wiring harness Gartner Banana

T SRS AIR BAG SYSTEM Possible cause Defective wiring harness Defective S-sensor Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GENER- AL PROCEDURES, page T-160. Service Code 23 Flowchart No.6 Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 H (GIB) and 2C (G) of the diagnostic module connector. Symptom I No Go to Step 3 Continuity Yes Step 3 1. Disconnect orange and blue S-sensor connectors. 2. Check for continuity between terminal B and E of the S- sensor. Action Replace diagnostic module (Refer to pane T-208) No I Replace S-sensor (Refer to page T-213) I Continuity Yes Action Replace wiring harness Gartner Banana