NO.2 AIR BAG SYSTEM WARNING LIGHT IS ILLUMINATED ALL THE TIME

id0803a3800600

2

Air bag system warning light is illuminated all the time.

DETECTION CONDITION

Malfunction in air bag system warning light circuit (open circuit or short to power supply).

POSSIBLE CAUSE

• Weak battery
• SAS control module malfunction
• Instrument cluster (print plate) malfunction
• No connection in SAS control module connector
• Poor contact in instrument cluster connector (16-pin)
• Open or short to power supply circuit in wiring harness between instrument cluster and SAS control module
• Poor contact at terminals 2T, 2U and/or 2W of SAS control module connector
• Poor contact in wiring harness between terminal 2T of SAS control module connector and ground
• Poor contact in wiring harness between SAS 10 A fuse and terminal 2U of SAS control module

Diagnostic Procedure

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, check to make sure connectors, terminals and wiring harness are connected correctly and undamaged.

Step

Inspection

Action

1
INSPECT BATTERY
• Measure voltage of battery.
• Is voltage 9 V or more?
Yes
Go to the next step.
No
Battery is weak.
Inspect charge/discharge system, then go to Step 10.
2
VERIFY THAT SAS CONTROL MODULE CONNECTOR IS CONNECTED
Warning
• Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.
(See SERVICE WARNINGS.)
(See SERVICE CAUTIONS.)
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the console.
• Are all SAS control module connectors securely connected?
Yes
Go to the next step.
No
Reconnect connector properly, then go to Step 10.
* 3
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR CONTINUITY
• Remove the column cover.
• Disconnect the clock spring connector.
• Remove the passenger-side air bag module.
• Disconnect the driver and passenger-side side air bag module connectors. (Vehicle with the side air bag)
• Remove the C-pillar trims. (Vehicle with curtain air bag)
• Disconnect the driver and passenger-side curtain air bag module connectors. (Vehicle with curtain air bag)
• Remove the B-pillar lower trims. (Vehicle with the pre-tensioner seat belt)
• Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with the pre-tensioner seat belt)
• Disconnect the SAS control module connector.
• Disconnect the instrument cluster connector.
• Is there continuity between SAS control module connector terminal 2W and instrument cluster connector terminal 1O?
Yes
Go to the next step.
No
Replace the air bag wiring harness, then go to Step 10.
* 4
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY
• Connect the negative battery cable.
• Turn the ignition switch to the ON position.
• Measure voltage at instrument cluster connector terminal 1O.
• Is voltage approx. 9 V or more?
Yes
Replace the air bag wiring harness, then go to Step 10.
No
Go to the next step.
5
CHECK TO SEE WHETHER MALFUNCTION IS IN AIR BAG SYSTEM WARNING LIGHT IN INSTRUMENT CLUSTER
• Connect the instrument cluster connector terminal 1O to ground, then reconnect
connector.
• Does air bag system warning light illuminate with ignition switch ON?
Yes
Replace the instrument cluster, then go to Step 10.
No
Go to the next step.
6
INSPECT POWER SUPPLY CIRCUIT OF SAS CONTROL MODULE (TERMINAL 2U)
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Connect the SAS control module connector.
• Connect the driver and passenger-side
pre-tensioner seat belt connectors. (Vehicles with the pre-tensioner seat belt)
• Connect the driver and passenger-side curtain air bag module connectors. (Vehicle with the curtain air bag)
• Connect the driver and passenger-side side air bag module connectors. (Vehicle with the side air bag)
• Connect the passenger-side air bag module connector.
• Connect the clock spring connector.
• Turn the ignition switch to the ON position.
• Inspect voltage for PID/DATA monitor VBATT item using WDS or equivalent.
• Is voltage of at least either terminal 9 V or more?
Yes
Go to Step 9.
No
Go to the next step.
7
INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK
• Remove the driver-side front side trim.
• Remove the fuse block without disconnecting connectors.
• Turn the ignition switch to the ON position.
• Measure voltage at terminals AM of fuse block.
• Is voltage of at least either terminal 9 V or more?
Yes
Go to the next step.
No
Repair the air bag wiring harnesses, then go to Step 9.
8
INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND SAS CONTROL MODULE
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the column cover.
• Disconnect the clock spring connector.
• Disconnect the passenger-side air bag module connector.
• Disconnect the driver and passenger-side side air bag module connectors. (Vehicle with the side air bag)
• Disconnect the driver and passenger-side curtain air bag module connectors. (Vehicle with the curtain air bag)
• Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with the pre-tensioner seat belt)
• Disconnect the SAS control module connector.
• Measure voltage at terminals 2U of SAS control module connector.
• Is voltage of at least either terminal 9 V or more?
Yes
Repair the SAS control module, then go to Step 10.
No
Repair the air bag wiring harnesses, then go to Step 10.
9
VERIFY THAT SAS CONTROL MODULE CONNECTOR TERMINAL 2T IS GROUND
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the column cover.
• Disconnect the clock spring connector.
• Remove the passenger-side air bag module.
• Disconnect the driver and passenger-side side air bag module connectors. (Vehicle with the side air bag)
• Remove the C-pillar trims. (Vehicle with the curtain air bag)
• Disconnect the driver and passenger-side curtain air bag module connectors. (Vehicle with curtain air bag)
• Remove the B-pillar lower trim. (Vehicle with the pre-tensioner seat belt)
• Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with the pre-tensioner seat belt)
• Remove the console.
• Disconnect the SAS control module connector.
• Inspect wiring harness between SAS control module connector terminal 2T and ground for the following:
- Short to power supply
- Open circuit
• Is wiring harness normal?
Yes
Replace the SAS control module, then go to the next step.
No
Replace the air bag wiring harnesses, then go to the next step.
10
CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Connect the SAS control module connector.
• Connect the driver and passenger-side
pre-tensioner seat belt connectors. (Vehicles with the pre-tensioner seat belt)
• Connect the driver and passenger-side curtain air bag module connectors. (Vehicle with the curtain air bag)
• Connect the driver and passenger-side side air bag module connectors. (Vehicle with the curtain air bag)
• Connect the passenger-side air bag module connector.
• Connect the clock spring connector.
• Connect the instrument cluster connector.
• Connect the negative battery cable.
• Turn the ignition switch to the ON position.
• Does air bag system warning light operate properly?
Yes
Complete troubleshooting, then explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.