Diagnostic Procedure
NO J1850 COMMUNICATION - SDARS (EARLY BUILD VEHICLES ONLY) - DIAGNOSTIC PROCEDURE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
Determine which modules this vehicle is equipped with before beginning.
NOTE:
When attempting to communicate with any of the modules on this vehicle, the DRBIII® will display 1 of 2 different communication errors: a NO RESPONSE message or a BUS +/- SIGNALS OPEN message. Turn the ignition on.Using the DRBIII®, attempt to communicate with the following control modules:Body Control Module (BCM)Instrument Cluster (MIC)Controller Antilock Brake (CAB)Was the DRBIII® able to communicate with one or more Module(s)?
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All |
| 2 | Turn the ignition off.
NOTE:
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
NOTE:
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
NOTE:
If the DRBIII® can not communicate with a single module, refer to the COMMUNICATION
for the related symptom. Were any problems found?
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All |
| 3 | Turn the ignition off. Disconnect the BCM C1 harness connector. Disconnect the DRBIII® from the Data Link Connector (DLC). Measure the resistance of the PCI Bus circuit between the Data Link Connector (DLC) and the BCM C1 connector. Is the resistance below 5.0 ohms?
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| 4 |
NOTE:
Reconnect the BCM C1 harness connector. Turn the ignition on.Measure the voltage of the PCI Bus circuit at the Data Link Connector (DLC).Is the voltage above 7.0 volts?
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| 5 |
NOTE:
Determine which modules this vehicle is equipped with before beginning. Turn the ignition off.Disconnect the BCM harness connectors and remove the Body Control Module from the Junction Block.Turn the ignition on.Measure the voltage of each PCI Bus circuit at the BCM C1, C3, C4 connectors and at the Junction Block Body Control Module connector cavity 10.Is the voltage steadily above 7.0 volts for any measurement?
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| 6 | Turn the ignition off. Disconnect the module that corresponds to the PCI Bus circuit that measured steadily above 7.0 volts. Turn the ignition on.
NOTE:
If the PCI Bus circuit for the Memory Heated Seat/Mirror Module was above 7.0 volts and is equipped with side airbags, disconnect each module one at a time.
NOTE:
If the PCI Bus circuit for the Radio was above 7.0 volts and is equipped with CD Changer, disconnect the CD Changer before the Radio. Measure the voltage of the PCI Bus circuit that previously measured above 7.0 volts. Is the voltage steadily above 7.0 volts with the module disconnected?
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All |
| 7 |
NOTE:
Determine which modules this vehicle is equipped with before beginning. Turn the ignition off.Disconnect the negative battery cable.Disconnect the BCM harness connectors and remove the Body Control Module from the Junction Block.Measure the resistance between ground and each of the PCI Bus circuits at the BCM C1, C3, C4 connectors and at the Junction Block Body Control Module connector cavity 10.Is the resistance below 1000.0 ohms for any of the measurements?
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| 8 | Turn the ignition off. Disconnect the negative battery cable. Disconnect the module that corresponds to the PCI Bus circuit that resistance measured below 1000.0 ohms.
NOTE:
If the PCI Bus circuit for the Memory Heated Seat/Mirror Module was below 1000.0 ohms and is equipped with side airbags, disconnect each module one at a time.
NOTE:
If the PCI Bus circuit for the Radio was below 1000.0 ohms and is equipped with a CD Changer, disconnect the CD Changer before the Radio. Measure the resistance between ground and the PCI Bus circuit that previously measured below 1000.0 ohms. Is the resistance below 1000.0 ohms with the module disconnected?
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All |