DTC 26

BME080201046W12

DTC 26

Driver-side side air bag module system

DETECTION CONDITION

Warning
• Detection conditions are for understanding DTC outline before performing inspection. Performing inspection with only detection conditions may cause injury due to operating error or damage the system. When performing inspection, always follow inspection procedure.
Note
• For vehicles without side air bag, DTC 22, 25, 26, 32, 35, or 37 may be indicated concurrently. In such a case, perform only the smallest DTC troubleshooting among them.
With side air bag
• Abnormal resistance (other than 1.63-2.71 W) detected in driver-side side air bag module circuit
• Short circuit in wiring harness related SAS unit terminal 1A or 1C
Without side air bag
• SAS unit connector terminal 2AA is open.

POSSIBLE CAUSE

With side air bag
• Driver-side side air bag module malfunction
• Malfunction of connector between driver-side side air bag module and SAS unit
• Open or short circuit in wiring harness between driver-side side air bag module and SAS unit
• SAS unit malfunction
Without side air bag
• Malfunction of connector between SAS unit and ground
• Open or short circuit in wiring harness between SAS unit and ground
• SAS unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
Is vehicle equipped with side air bag?
Yes
Go to next step.
No
Go to Step 5.
2
INSPECT SEPARATOR* OF DRIVER-SIDE SIDE AIR BAG MODULE CONNECTOR
Warning
• Handling air bag system components improperly can accidentally deploy air bag modules and pre-tensioner seat belts, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling air bag system components. See SERVICE WARNINGS.
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait for more than 1 minute.
• Disconnect driver-side side air bag module connector.
• Is separator* of driver-side side air bag module connector okay?
 
*: Consists of two parts of female connector that separate short bar from terminal when connected to male connector.
Yes
Present malfunction diagnosis:
• Go to next step.
Past malfunction diagnosis:
• Go to Step 4.
No
Replace wiring harness.
3
VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE SIDE AIR BAG MODULE OR OTHER PARTS
• Connect leads of SST (Fuel And Thermometer checker) or apply 2 W resistor to driver-side side air bag module connector terminals A and B.
• Set resistance of SST (Fuel And Thermometer checker) to 2 W.
• Connect negative battery cable.
• Turn ignition switch to ON position.
• Is DTC 26 indicated?
Yes
Go to next step.
No
Replace driver-side side air bag module.
4
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE SIDE AIR BAG MODULE AND SAS unit
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait for more than 1 minute.
• Remove clock spring.
• Remove glove compartment.
• Disconnect passenger-side air bag module connector.
• Disconnect passenger-side side air bag module connector.
• Remove B-pillar lower trims. (Vehicle with pre-tensioner seat belt)
• Disconnect driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with pre-tensioner seat belt)
• Turn up floor covering.
• Disconnect all SAS unit connectors.
• Inspect following wiring harness between SAS unit and driver-side side air bag module terminals (harness side) for short to ground, short to power supply, and open circuit :
- 1A and A
- 1C and B
• Are wiring harnesses okay?
Yes
Present malfunction diagnosis:
• Remove SAS unit.
Past malfunction diagnosis:
• Replace driver-side side air bag module.
No
Replace wiring harnesses.
5
VERIFY THAT SAS unit CONNECTOR TERMINAL 2AA IS GROUNDED
Warning
• Handling air bag system components improperly can accidentally deploy air bag modules and pre-tensioner seat belts, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling air bag system components. See SERVICE WARNINGS.
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait for more than 1 minute.
• Remove clock spring.
• Remove glove compartment.
• Disconnect passenger-side air bag module connector.
• Remove B-pillar lower trims. (Vehicle with pre-tensioner seat belt)
• Disconnect driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with pre-tensioner seat belt)
• Turn up floor covering.
• Disconnect all SAS unit connectors.
• Inspect wiring harness between SAS unit connector terminal 2AA and ground for following.
- Short to power supply
- Open circuit
• Is wiring harness okay?
Yes
Present malfunction diagnosis:
• Replace SAS unit.
Past malfunction diagnosis:
• Troubleshooting completed.
No
Replace wiring harness.