Circuit Description
An auxiliary video input jack closes the auxiliary detection signal circuit. If the auxiliary detection signal circuit opens, the radio sets this DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2475 Navigation Display Head (NDH) Auxiliary Input Performance
Conditions for Running the DTC
| • | The navigation radio must detect one of the following power modes: |
| - | ACC |
| - | ON |
| - | RAP |
| - | RAP UNLCK |
| • | The navigation system must be equipped with the TV option (RPO UE7). |
| • | The radio does not set this DTC if B1328 or B1327 is current. |
Conditions for Setting the DTC
The radio tests the auxiliary detection signal circuit every second.
Action Taken When the DTC Sets
| • | Cannot play auxiliary inputs in to the TV. |
| • | The AUX SWITCH is not displayed on the screen. |
Conditions for Clearing the DTC
A current DTC clears and becomes a history DTC if the navigation radio does not detect the failure for more than one second.
Diagnostic Aids
An intermittent condition may be caused by the following:
| • | Mis-routed harness |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
| • | Poor connections in the harness connectors. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Determines if the malfunction is present.
-
Tests the auxiliary detection signal for the correct voltage range.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Navigation System Schematics | ||||
Did you perform Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | |
Is the value within the range specified? | 4.5-5.5 V | Go to Step 6 | Go to Step 3 | |
3 |
Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 4 |
4 | Inspect for poor connections at the harness connector of the navigation radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 5 |
5 | Replace the navigation radio. Refer to Control Module References in Computer/Integrating Systems. Did you complete the replacement? | -- | Go to Step 8 | -- |
6 | Inspect for poor connections at the harness connector of the auxiliary RCA video jacks. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
7 | Replace the auxiliary RCA video jacks. Refer to Audio/Video Wiring Harness Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
