Circuit Description
The backlighting error detection is determined inside the navigation radio. No external circuits are involved.
Conditions for Running the DTC
| • | The navigation radio checks for a backlighting internal error every five seconds during the following power modes: |
| - | ACC |
| - | ACC |
| - | ON |
| • | DTC B2474 does not set if DTC B1328 or DTC B1327 is current. |
Conditions for Setting the DTC
A B2474 sets if any of the following conditions are present:
| • | Backlighting circuit/bulb failure. |
| • | Backlighting circuit current consumption is too high. |
| • | Backlighting heater is not providing heat. |
| • | The navigation radio temperature is over 105°C (221°F). |
Action Taken When the DTC Sets
Any of the following may be observed:
| • | Black screen and the audio and navigation functions cannot be controlled. |
| • | The screen brightness is incorrect. |
| • | Changes to the screen brightness are inconsistent. |
Conditions for Clearing the DTC
The navigation radio determines that the backlighting fault is not present.
Diagnostic Aids
This DTC may be stored as a history DTC without affecting the operation of the navigation radio. If stored only as a history DTC and not a current DTC, do not replace the radio.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Determines if the malfunction is present.
-
Verifies that the DTC sets under normal operating conditions.
Step | Action | Yes | No |
|---|---|---|---|
Did you perform the Diagnostic System Check - Navigation System? | Go to Step 2 | ||
Is B2474 a current DTC? | Go to Step 3 | ||
3 | Replace the navigation radio. Refer to Radio Replacement in Entertainment. Did you complete the replacement? | Go to Step 4 | -- |
4 |
Does the DTC reset? | Go to Step 2 | System OK |
