DTC 25

BME080201046W11

DTC 25

Driver-side side air bag sensor system (Communication error)

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
• Malfunction in wiring harness between driver-side side air bag sensor and SAS unit
• Malfunction in driver-side side air bag sensor circuit
Without side air bag
• SAS unit connector terminal 2AA is open.

POSSIBLE CAUSE

With side air bag
• Driver-side side air bag sensor malfunction
• Open or short circuit in wiring harness between driver-side side air bag sensor 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 WIRING HARNESS BETWEEN DRIVER-SIDE SIDE AIR BAG SENSOR AND SAS UNIT
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.
• Disconnect driver and passenger-side side air bag module connectors.
• 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.
• Disconnect driver-side side air bag sensor connector.
• Inspect following wiring harness between SAS unit and driver-side side air bag sensor terminals (harness side) for short to ground, short to power supply, and open circuit:
- 1B and A
- 1D and B
- 1F and C
- 1E and D
• Are wiring harnesses okay?
Yes
Present malfunction diagnosis:
• Go to next step.
Past malfunction diagnosis:
• Replace driver-side side air bag sensor.
No
Replace wiring harnesses.
3
INSPECT DRIVER-SIDE SIDE AIR BAGSENSOR
• Measure resistance between driver-side side air bag sensor terminal C and D?
• Is resistance approximately 1kW?
Yes
Go to next step.
No
Replace SAS unit.
4
VERIFY WHETHER DRIVER-SIDE SIDE AIR BAG SENSOR IS MALFUNCTIONING OR NOT
• Connect all SAS unit connectors.
• Connect driver -side side air bag sensor connector.
• Connect clock spring connector.
• Connect passenger-side air bag module connector.
• Connect driver- and passenger-side side air bag module connectors.
• Connect driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with pre-tensioner seat belt)
• Connect negative battery cable.
• Turn ignition switch to ON position.
• Is DTC 25 indicated?
Yes
Replace driver-side side air bag sensor, then go to next step.
No
Replace SAS unit.
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.
• 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)
• Disconnect passenger-side air bag module connector.
• 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.