AIR BAG SYSTEM WARNING LIGHT ILLUMINATES CONSTANTLY [AIR BAG SYSTEM]

id0803a3814400

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 terminal D and SAS control module terminal 2AD


System Wiring Diagram

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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
•  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.
•  Switch the ignition off.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the rear console.
•  Are all SAS control module connectors securely connected?
Yes
Go to the next step.
No
Reconnect the connector properly, then go to Step 8.
3
VERIFY THAT INSTRUMENT CLUSTER CONNECTOR IS CONNECTED
•  Disconnect the instrument cluster connector.
•  Are all instrument cluster connectors securely connected?
Yes
Go to the next step.
No
Reconnect the connector properly, then go to Step 8.
4
INSPECT DTCs IN SAS CONTROL MODULE
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Clear the DTC for the SAS control module using the M-MDS.
•  Inspect the DTC for the SAS control module on-board diagnostic system.
•  Have DTCs been recorded in memory?
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
•  Inspect the DTC for the instrument cluster on-board diagnostic system.
•  Have DTCs been recorded in memory?
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
•  Turn on all warning lights and indicator lights using the instrument cluster PID WL+IL of simulation function using the M-MDS.
•  Do other warning and indicator lights illuminate?
Yes
Go to the next step.
No
Repair the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
Then go to Step 8.
7
INSPECT SAS CONTROL MODULE POWER SUPPLY CIRCUIT
Warning
•  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.
•  Switch the ignition off.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side front seat connector.
•  Remove the B-pillar lower trim.
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
•  Remove the trunk side trim. (with rear pre-tensioner seat belt)
•  Disconnect the driver and passenger-side rear pre-tensioner seat belt connectors. (with rear pre-tensioner seat belt)
•  Remove the headliner.
•  Disconnect the driver and passenger-side curtain air bag module connectors.
•  Disconnect all SAS control module connectors.
•  Connect the negative battery cable.
•  Switch the ignition ON (engine off or on).
•  Measure the voltage at the following terminal (wiring harness-side):
―  SAS control module terminal 2AD
•  Is the voltage 8.1 V—15.9 V?
Yes
Go to the next step.
No
Inspect the SRS1 7.5 A fuse.
•  If the fuse is blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between SRS1 7.5 A fuse and SAS control module terminal.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
―  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If the fuse is normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between IG1 relay terminal and SAS control module terminal.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  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.
•  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.