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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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AIR BAG SYSTEM WARNING LIGHT ILLUMINATES CONSTANTLY [AIR BAG SYSTEM]

Description

  • Air bag system warning light is illuminated constantly and remains illuminated after 6 s have elapsed.

Possible cause

  • Weak battery

  • SAS control module connectors are poorly connected

  • Instrument cluster connector is poorly connected

  • SAS control module malfunction

  • Instrument cluster malfunction

  • SAS control module power supply circuit malfunction

    • Short to ground in wiring harness between SRS1 7.5 A fuse and SAS control module terminal 2AD

    • SRS1 7.5 A fuse malfunction

    • Open circuit in wiring harness between IG1 relay and SAS control module terminal 2AD

System Wiring Diagram

Diagnostic Procedure

Step

Inspection

Action

1

 INSPECT BATTERY

  • Measure the voltage of battery.

  • Is the voltage 8 V or more?

Yes

Go to the next step.

No

Battery is weak.

Inspect charge/discharge system, then go to Step 8.

(See BATTERY INSPECTION.)

2

 VERIFY THAT SAS CONTROL MODULE CONNECTOR IS CONNECTED

WARNING:

Yes

Go to the next step.

No

Reconnect the connector properly, then go to Step 8.

3

 VERIFY THAT INSTRUMENT CLUSTER CONNECTOR IS CONNECTED

Yes

Go to the next step.

No

Reconnect the connector properly, then go to Step 8.

4

 INSPECT DTCs IN SAS CONTROL MODULE

Yes

Perform the applicable DTC inspection, then go to Step 8.

(See DTC TABLE [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].)

(See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)

No

Go to the next step.

5

 INSPECT DTCs IN INSTRUMENT CLUSTER

Yes

Perform the applicable DTC inspection, then go to Step 8.

(See DTC TABLE [INSTRUMENT CLUSTER].)

No

Go to the next step.

6

 VERIFY WHERE MALFUNCTION IS IN WARNING LIGHTS INDICATION CIRCUIT OR ELSEWHERE

Yes

Go to the next step.

No

Repair the instrument cluster.

(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

Then go to Step 8.

7

 INSPECT POWER SUPPLY CIRCUIT OF SAS CONTROL MODULE (TERMINAL 2AD)

WARNING:

Yes

Go to the next step.

No

Inspect the SRS1 7.5 A fuse.

  • If a fuse is burnt out:

    • Repair or replace the wiring harness which is shorted to ground.

    • Replace the fuse.

  • Replace the fuse.

    • Replace the fuse.

  • If the fuse is normal:

    • Repair or replace the wiring harness which has an open circuit.

Go to the next step.

8

 VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

  • Connect the SAS control module connectors.

  • Reconnect all disconnected connectors.

  • Connect the negative battery cable.

    (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

  • Switch the ignition ON (engine off or on).

  • Does the air bag system warning light illuminate for approx. 6 s and turn off?

Yes

Complete troubleshooting, then explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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