AIR BAG MAZDA MX-5 1994 Repair Manual

SRS AIR BAG SYSTEM T u Possible cause Poor connection of diagnostic module connector Defective diagnostic module Defective wiring harness Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Air bag warning light remains ON Flowchart No.2 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. Symptom Step 3 1. Disconnect the diagnostic module connector. 2. Remove the shorting bar from the diagnostic module connector. 3. Check the air bag warning light. Light condition I Action I Illuminate Repair wiring harness (Diagnostic modul~lnstrument duster) I Not illuminate 1 Replace diagnostic module (Refer to Dacie T-208) Gartner Banana

T SRS AIR BAG SYSTEM Possible cause ij Defective diagnostic module Defective wiring harness Defective S-sensor Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Service Code 12 Flowchart No.3 Step 2 Check the ENGINE fuse. Fuse Action I Symptom 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- OK Burnt tic module connector. Go to Step 3 Go to Step 4 B+: Battery positive voltage - Other Repair wiring harness iEGI INJ fuss-Diaanostic module1 I Voltage B+ -- ~ Action Replace diagnostic module (Refer to page T-208) I NO Replace diagnostic module (Refer to Daae T-2081 Step 4 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 H (GIB) of the diagnostic module connector and ground. Step 5 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between terminal 2C (G) of the diag- nostic module connector and ground. 1 Continuity Action 1 Continuity Yes Action Go to Step 5 Yes No Replace wiring harness Go to Step 6 L Gartner Banana

SRS AIR BAG SYSTEM Step 6 Check for continuity between terminal 1H (G/B) of the diagnostic module connector and ground. I Flowchart No.4 I Symptom I Service Code 21 I Continuity Yes I No I Replace S-sensor (Refer to page T-213) I Action Replace air bag wiring harness and EGI INJ fuse Possible cause Defective S-sensor Defective wiring harness Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 E (RIB) of the diagnostic module connector and ground. I Continuitv Action 1 Yes Replace diagnostic module (Refer to page T-208) I NO I GO to step 3 Step 3 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between terminal A of the S-sensor and ground. Continuity 1 Action I 1 yes I Replace wiring harness I I No I Replace S-sensor (Refer to page T-213) I Gartner Banana

T SRS AIR BAG SYSTEM Possible cause Defective diagnostic module Defective S-sensor Defective wiring harness Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 1 H (GIB) or 2C (G) and terminal 28 (GNV) or 2D (GNV) of the diagnostic module connector. Step 3 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between termional B or E and termi- nal C or D of the S-sensor connector. Continuity Yes No I Continuity Action I Action Replace diagnostic module (Refer to page T-208) Go to Step 3 1 Yes I Replace S-sensor (Refer to page T-213) I I I NO I Replace wiring harness I Gartner Banana

SRS AIR BAG SYSTEM T Possible cause Defective S-sensor Defective wiring harness Defective diagnostic module Flowchart No.6 Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminals 2C (G) and 1 H (G/B) of the diagnostic module connector. I Continuity I Action I Symptom Service Code 23 Step 3 1. Disconnect the orange and blue S-sensor connectors. 2. Check for continuity between terminals E and B of the S-sensor. Yes No Replace diagnostic module (Refer to page T-208) Go to Step 3 I No I Replace S-sensor (Refer to ~aae T-213) I Continuity Yes Action Replace wiring harness Gartner Banana

SRS AIR BAG SYSTEM Possible cause Defective wiring harness Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Service Code 24 Flowchart No.7 Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminals 2B (GMI) and 20 Symptom (GNV) of the diagnbstic module connector.' Continuity I Action 1 No I Replace wiring harness I Yes Replace diagnostic module (Refer to page T-208) Gartner Banana

SRS AIR BAG SYSTEM T L Possible cause Flowchart No.8 Defective air bag module Defective clock spring Defective wiring harness Defective diagnostic module Warning Handling the air bag module improperly can accidently deploy the air bag, which may seri- ously injure you. Read SERVICE WARNINGS, page T-159, before handling the air bag module. Symptom Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Service Code 32 Step 2 1. Remove the air bag module. 2. Install a 1 -ohm (rated power 1 W) resistor between termi- nals B and C of the air bag module connector. 3. Connect the negative battery cable. 4. Turn the ignition switch to ON and check the service code. 1 Other I Replace air baa module (Refer to paae T-206) I Service code 32 Step 3 1. Disconnect the clock spring connector. 2. Install a 1-ohm (rated power 1 W) resistor between termi- nals B and C of the clock spring connector. 3. Connect the negative battery cable. 4. Turn the ignition switch to ON and check the service code. I Service code Action I Action Remove 1 -ohm resistor and go to Step 3 I 32 I Remove 1 -ohm resistor and ao to Ste~ 4 I 1 Other Replace combination switch (Refer to page T-19) Step 4 1. Turn the ignition switch to LOCK. 2. Disconnect the negative battery cable. 3. Disconnect the diagnostic module connector. 4. Measure the resistance between terminals 2D (GNV) and 2F (GY) of the diagnostic module connector. Resistance 1 R More than 1R Action Replace diagnostic module (Refer to page T-208) Replace wiring harness Gartner Banana

T SRS AIR BAG SYSTEM I Flowchart No.9 I Symptom I Service Code 34 I Possible cause Defective air bag module Defective clock spring Defective wiring harness Defective diagnostic module Warning Handling the air bag module improperly can accidently deploy the air bag, which may seri- ously injure you. Read SERVICE WARNINGS, page T-159, before handling the air bag module. Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Step 2 1. Remove the air bag module. 2. Make sure the shorting bars at the diagnostic module connector, clock spring connectors, and air bag module are properly installed. Note An engaged shorting bar or poorly mated connector can cause code 34 to set. 3. Connect the negative battery cable. 4. Turn the ignition switch to ON and check the service code. -- Step 3 1. Turn the ignition switch to LOCK. 2. Disconnect the clock spring connector. 3. Turn the ignition switch to ON and check the service code. Service code 32 34 Action Replace air bag module (Refer to page T-206) Go to Step 3 Step 4 1. Turn the ignition switch to LOCK. 2. Disconnect the negative battery cable. 3. Disconnect the diagnostic module connector. 4. Measure the resistance between terminals 2D (GNV) and 2F (GY) of the diagnostic module connector. Service code 32 Action Replace combination switch (Refer to page T-19) 1 Less than 1 R I Replace wiring harness I Resistance 1 a Action Replace diagnostic module (Refer to page T-208) d Gartner Banana

SRS AIR BAG SYSTEM T LJ Possible cause Poor connection of D-sensor connector Defective D-sensor Defective wiring harness Defective diagnostic module Flowchart No.10 Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Step 2 1. Disconnect the diagnostic module connector, 2. Measure the resistance between terminals 2L (BR/B) and 2E (BR) of the diagnostic module connector. Symptom Service Code 41 1 Other I Go to Ste~ 3 I Resistance 1.18 kn Action Go to Step 4 11.18 kn I I Redace wirina harness I Step 3 1. Disconnect the left D-sensor connector. 2. Measure the resistance between terminals A and B of the left D-sensor connector. Resistance Step 4 Measure the resistance between terminals 2H (BW) and 1 A (BR/R) of the diagnostic module connector. Action I Other I Resistance Action I Replace left 0-sensor (Refer to page T-210) 1.18 kn Other Go to Step 6 Go to Step 5 Step 5 1. Disconnect the center D-sensor connector. 2. Measure the resistance between terminals A and B of the center D-sensor. Resistance 1.18 kn Other Action Replace wiring harness Replace center D-sensor (Refer to page T-210) T-197 Gartner Banana

T SRS AIR BAG SYSTEM Step 6 Measure the resistance between terminals 2J (BRN) and 1 C (BRIG) of the diagnostic module connector. I Resistance I Action I - Step 7 1. Disconnect the right D-sensor connector. 2. Measure the resistance between terminals A and B of 1.18 kR Other the right-D-sensor. Replace diagnostic module (Refer to page T-208) Go to Step 7 Resistance 1.18 WZ Action Replace wiring harness Other Replace right D-sensor (Refer to page T-210) Gartner Banana