The number(s) below refer to the step number(s) on the diagnostic table.
Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
The symptoms list in Symptoms will determine the correct diagnostic procedure to use.
The presence of DTCs U1161, U1162, U1163 or U1170 indicate one or more of the door modules is not communicating on the SBI circuits.
The presence of DTCs which begin with U indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
Step | Action | Yes | No | ||||||||
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Schematic Reference: Keyless Entry Schematics | |||||||||||
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications | ||||||||
Does the scan tool communicate with all of the listed modules? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||||||
3 |
Important: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
Does the ignition switch parameter reading match the ignition switch position for all switch positions? | Go to Step 4 | Go to Power Mode Mismatch in Body Control System | ||||||||
Select the display DTC function on the scan tool for the following modules:
Does the scan tool display any DTCs? | Go to Step 5 | Go to Symptoms - Keyless Entry | |||||||||
Does the scan tool display DTCs U1161, U1162, U1163 or U1170? | Go to Diagnostic Trouble Code (DTC) List in Doors | Go to Step 6 | |||||||||
Does the scan tool display any DTCs which begin with a U? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 7 | |||||||||
7 | Does the scan tool display DTC B1000, B1007, B1009 or B1010? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 8 | ||||||||
8 | Does the scan tool display DTC B1327? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical |