DTC B1877, B1878, B1879, B1885
id080200801400
DTC |
B1877 |
Driver-side pre-tensioner seat belt circuit resistance high |
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B1878 |
Driver-side pre-tensioner seat belt circuit short to power supply |
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B1879 |
Driver-side pre-tensioner seat belt circuit short to ground |
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B1885 |
Driver-side pre-tensioner seat belt circuit resistance low |
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DETECTION CONDITION
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• Abnormal resistance (other than 1.5—3.1 ohms) detected in the driver-side pre-tensioner seat belt circuit
• Malfunction in the wiring harness between the driver-side pre-tensioner seat belt and SAS control module
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POSSIBLE CAUSE
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• Driver-side pre-tensioner seat belt connector malfunction
• Open or short circuit in the wiring harness between the driver-side pre-tensioner seat belt and SAS control module
• Driver-side pre-tensioner seat belt malfunction
• SAS control module malfunction
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Diagnostic procedure
Step |
Inspection |
Action |
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1
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INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT CONNECTOR
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the following parts:
• Inspect the driver-side pre-tensioner seat belt connector. (Corrosion, damage, and disconnected pins)
• Is there any malfunction of the driver-side pre-tensioner seat belt connector?
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Yes
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Replace the driver-side pre-tensioner seat belt wiring harness.
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No
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Go to the next step.
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2
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INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT
• Connect the SST (Fuel and thermometer checker) or apply 2-ohm resistance to the driver-side pre-tensioner seat belt connector terminals A–B.
• Set the SST (Fuel and thermometer checker) to 2 ohm.
• Connect the negative battery cable.
• Perform the DTC inspection for the SAS control module using the M-MDS.
(See DTC DISPLAY.)
• Are DTCs B1877, B1878, B1879 and/or B1885 displayed?
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Yes
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Go to the next step.
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No
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Replace the driver-side pre-tensioner seat belt.
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3
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INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND DRIVER-SIDE PRE-TENSIONER SEAT BELT
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Disconnect the SST (Fuel and thermometer checker) or the 2 ohm resistance.
• Disconnect all SAS control module connectors.
• Inspect the wiring harnesses between SAS control module connector terminal 2S and driver-side pretensioner seat belt connector terminal A, and SAS control module connector terminal 2P and driver-side pre-tensioner seat belt connector terminal B for the following:
• Is the wiring harness normal?
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Yes
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Go to the next step.
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No
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Replace the wiring harness between the SAS control module and the driver-side pre-tensioner seat belt.
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4
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INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND DRIVER-SIDE PRE-TENSIONER SEAT BELT 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 2S and 2P.
• Is the voltage measured?
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Yes
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Replace the wiring harness between the SAS control module and the driver-side pre-tensioner seat belt.
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No
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Go to the next step.
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5
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INSPECT DTCs
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Connect all disconnected connectors.
• Connect the negative battery cable.
• Clear DTCs using the M-MDS.
(See CLEARING DTC.)
• Verify DTCs using the M-MDS.
(See DTC DISPLAY.)
• Is DTC B1877, B1878, B1879 and/or B1885 displayed again?
• Are there other DTCs output?
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Yes
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Replace the SAS control module.
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No
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DTC troubleshooting completed.
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