DTC B1869, B1870

id080200801300

DTC

B1869
•  Air bag system warning light circuit open (the air bag system warning light is continuously illuminated.)
•  Air bag system warning light circuit short to body ground (the air bag system warning light is never illuminated.)

B1870

Air bag system warning light system circuit short to power supply (the air bag system warning light is continuously illuminated.)
DETECTION CONDITION
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  Malfunction in the air bag system warning light circuit
POSSIBLE CAUSE
•  Open or short circuit in the wiring harness between the battery and the instrument cluster
•  Open or short circuit in the wiring harness between the instrument cluster and SAS unit
•  Instrument cluster malfunction
•  SAS unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FOR CONTINUITY BETWEEN BATTERY FUSE AND INSTRUMENT CLUSTER
•  Turn the ignition switch to the ON position.
•  Measure the voltage at instrument cluster connector terminal 1G.
Note
•  Measure the voltage while shaking the wiring harness between the battery and instrument cluster.
•  Is the voltage 9 V or more?
Yes
Go to the next step.
No
Repair the related wiring harness.
2
INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS UNIT
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.
•  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 glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side curtain air bag module connectors.
•  Disconnect the driver and passenger-side side air bag module connectors.
•  Remove the rear door lower trim.
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
•  Partially peel back the floor covering.
•  Disconnect the SAS unit connector.
•  Disconnect the instrument cluster connector.
•  Inspect the wiring harness between SAS unit terminal 1T and instrument cluster terminal 2K for the following:
Note
•  Measure the voltage while shaking the wiring harness between the SAS unit and instrument cluster.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the air bag wiring harness.
3
INSPECT THE WIRING HARNESS BETWEEN THE SAS UNIT AND INSTRUMENT CLUSTER FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position with SAS unit connector and instrument cluster connector disconnected.
•  Measure the voltage of SAS unit connector terminals 1T of SAS unit harness side connector.
Note
•  Measure the voltage while shaking the wiring harness between the SAS unit and instrument cluster.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS unit and the Instrument cluster.
No
Go to the next step.
4
INSPECT INSTRUMENT CLUSTER
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Connect the instrument cluster connector.
•  Ground instrument cluster connector terminal 2K using a jumper wire.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Does the air bag system warning light illuminate?
Yes
Go to the next step.
No
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION)
5
INSPECT DTCs
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Clear DTCs using the WDS or eguivalent. (See CLEARING DTC.)
•  Perform the DTC inspection for the SAS unit using the WDS or eguivalent. (See DTC DISPLAY.)
•  Are the same DTCs present?
Yes
Replace the SAS unit.
(See SAS UNIT REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.