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
•  Malfunction of the connectors between the instrument cluster and SAS control module
•  Open or short circuit in the wiring harness between the instrument cluster and SAS control module
•  Instrument cluster malfunction
•  SAS control module 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 2K.
•  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 CONTROL MODULE
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 control module connector.
•  Disconnect the instrument cluster connector.
•  Inspect the wiring harness between SAS control module terminal 1T and instrument cluster terminal 2K for the following:
―  Short to ground
―  Open circuit
Note
•  Inspect for continuity while shaking the wiring harness between the SAS control module 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 CONTROL MODULE AND INSTRUMENT CLUSTER FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Measure the voltage of SAS control module connector terminals 1T
Note
•  Measure the voltage while shaking the wiring harness between the SAS control module and instrument cluster.
•  Is the voltage measured?
Yes
Replace the air bag wiring harness.
No
Go to the next step.
4
INSPECT AIR BAG SYSTEM WARNING LIGHT
•  Connect the instrument cluster connector.
•  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 AIR BAG SYSTEM WARNING LIGHT
•  Ground instrument cluster connector terminal 2K to the body using a jumper wire.
•  Does the air bag system warning light go out?
Yes
Go to the next step.
No
Replace the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION)
6
INSPECT DTCs
•  Clear DTCs using the M-MDS.
•  Verify DTCs using the M-MDS.
•  Is DTC B1869, B1870 displayed again?
•  Are there other DTCs output?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.