service MAZDA MX-5 1994 Manual Online

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

SRS AIR BAG SYSTEM T L Possible cause Poor installation of right D-sensor Defective right D-sensor Defective wiring harness Defective diagnostic module Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. Service Code 44 Flowchart No.11 Symptom Step 3 1. Disconnect the right D-sensor connector. 2. Check for continuity between terminal B of the right D-sensor and ground. I Continuity I Action Step 2 1. Disconnect the diagnostic module connector. 2. Check for continuity between terminal 2J (BRN) of the diagnostic module connector and ground. 1 Yes I Replace wiring harness Continuity Yes No Action Replace diagnostic module (Refer to page T-208) Go to Step 3 No Replace right D-sensor (Refer to page T-210) Gartner Banana

T SRS AIR BAG SYSTEM Possible cause Poor installation of center D-sensor Defective center D-sensor Defective wiring harness Defective diagnostic module Flowchart No.12 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 2H (BRAN) of the diagnostic module connector and ground. Symptom Service Code 45 Step 3 1. Disconnect the center D-sensor connector. 2. Check for continuity between terminal B of the center D-sensor and ground. Continuity Yes No I Continuitv I Action I Action Replace diagnostic module (Refer to page T-208) Go to Step 2 Yes I Replace wiring harness I No Replace center D-sensor (Refer to page T-210) Gartner Banana

SRS AIR BAG SYSTEM T Possible cause Poor installation of left D-sensor Defective left D-sensor Defective wiring harness Defective diagnostic module Flowchart No.13 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 2E (BR) of the diagnostic module connector and ground. Symptom Service Code 46 Step 3 1. Disconnect the left D-sensor connector. 2. Check for continuity between terminal B of the left D-sen- sor and ground. Continuity Yes No Action Replace diagnostic module (Refer to page T-208) GO to Step 3 Replace left D-sensor (Refer to page T-210) I Continuity Yes Action Replace wiring harness Gartner Banana

SRS AIR BAG SYSTEM Possible cause Defective air bag module Defective clock spring Ddfective S-sensor Defective D-sensor Defective diagnostic module Defective wiring harness Service Code 13 Flowchart No.14 Note When fault code 13 sets, the air bag unit blows an internal non-replaceable thermal fuse to prevent accidental deployment of the air bag. The air bag unit must be replaced once code 13 has set, but should not be replaced until the cause for the fault is repaired. Symptom Step 1 Carry out "Before Servicing" procedure under GEN- ERAL PROCEDURES, page T-1 60. 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 d 1 code. 1 Other I Go to Step 3 Service code 51 Step 3 1. Turn the ianition switch to LOCK. Action Replace air bag module and then replace diagnostic module 2. ~isconnegt the diagnostic module connector. 3. Check for continuity between terminal 2F (GY) of the diagnostic module connector and ground. I Continuity Action 1 Step 4 1. Disconnect the clock spring connector. 2. Check for continuity between terminal 2F (GY) of the diagnostic module connector and ground. Yes No Continuity Yes Go to Step 4 Go to Step 6 Gartner Banana

T SRS AIR BAG SYSTEM Step 9 1. Disconnect the left D-sensor connector. 2. Check for continuity between terminal B of the left D-sen- sor and ground. il I Continuity I Action I Step 10 Check for continuity between terminal 1 C (BRIG) of the diagnostic module connector and ground. I Continuity Action 1 Yes No I Yes I GO to step 11 Replace D-sensor and then replace diagnos- tic module Replace air bag harness and then replace diagnostic module Step 11 1. Disconnect the right D-sensor connector. 2. Check for continuity between terminal B of the right No D-sensor connectoiand ground. Replace diagnostic module (Refer to page T-208) Continuity Action Replace D-sensor and then replace diagnos- tic module Replace air bag harness and then replace I Flowchart No.15 I Symptom 1 Service Code 51 I Possible cause Blown internal fuse in diagnostic module (fault conditions no longer present) Diagnostic module not replaced after service code 13 set and conditions corrected Intermittent short in air bag deployment circuit Remedy If repairs were made for a service code 13, replace the diagnostic module. If an intermittent short is sus- pected, inspect the wiring harnesses and connectors for damage. If they are not damaged, wiggle the harness and connectors to induce the intermittent short; service code 13 will be set when the fault is induced. Then follow the troubleshooting procedure for service code 13. Gartner Banana