Circuit Description
When the Navigation Display Module is running through System Inspection Mode, it tests the Chip Bus Request signal. The Navigation Display Module does this by sending a signal from pin 16 of connector C2 to pin 1 of the Navigation Data Processor connector C1 on circuit 1692.
Conditions for Running the DTC
Navigation Display Module is running through System Inspection Mode.
Conditions for Setting the DTC
| • | An invalid Chip Bus Request signal from the Navigation Data Processor is detected during System Inspection Mode. |
| • | An invalid Chip Bus Request signal from the Navigation Display Module is detected during System Inspection Mode. |
| • | The Chip Bus Request circuit 1692 open or shorted to ground. |
Action Taken When the DTC Sets
| • | Audio related operations will slow down if DTC was set due to an invalid Chip Bus Request signal from the Navigation Data Processor. |
| • | Navigation operation will slow down if DTC was set due to an invalid Chip Bus Request signal from the Navigation Display Module. |
| • | All operations will slow down if DTC was set due to a short to ground condition on the Chip Bus Request circuit. |
| • | This failure will have no effect outside the Navigation System. |
Conditions for Clearing the MIL/DTC
| • | A current DTC will clear when the Navigation Display Module does not detect the failure during the last execution of the System Inspection Mode. |
| • | A history DTC will clear using a scan tool. |
Diagnostic Aids
| • | An intermittent may be caused by the following: |
| - | Mis-routed harness |
| - | Rubbed through wire insulation |
| - | Broken wire inside the insulation |
| • | Cycle the Ignition Switch even after a successful inspection with a scan tool so initialization will occur. |
| • | DTC U2152 will not set if DTC B1328, DTC B1327, or DTC U2150 is current. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Determines if the malfunction is present.
-
Checks circuit 1692 for a short to B+ condition.
-
Checks circuit 1692 for a short to ground condition.
-
Determines if the malfunction is due to an internal fault in the Navigation Display Module or an open condition in circuit 1692.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Navigation Diagnostic System Check performed? | -- | |||
Is the voltage measured within the specified range? | 0 V | |||
Measure the resistance between cavity 1 of the Navigation Data Processor harness connector C1 and ground with a DMM. Is the resistance measure within the specified range? | ∞ | |||
4 | Repair short to B+ in circuit 1692 between cavity 1 of the Navigation Data Processor connector C1 and cavity 16 of the Navigation Display Module connector C2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
Measure the resistance between cavity 1 of the Navigation Data Processor harness connector C2 and cavity 16 of the Navigation Display Module harness connector C2 with a DMM. Is the resistance measure within the specified range? | 0-2 ohms | |||
6 | Repair short to ground in circuit 1692 between cavity 1 of the Navigation Data Processor connector C1 and cavity 16 of the Navigation Display Module connector C2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
7 | Replace the Navigation Display Module. Refer to Navigation Display Module Replacement in Instrument Panel, Gages, and Console. Is the replacement complete? | -- | -- | |
8 | Repair the open in circuit 1692 between cavity 1 of the Navigation Data Processor connector C1 and cavity 16 of the Navigation Display Module connector C2. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
9 |
Has the test run and passed? | -- | -- |
