Cellular, Entertainment, and Navigation
DTC B2625
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B2625 01
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Display Dimming Pulse Width Modulation (PWM) Output Circuit Short to Voltage
DTC B2625 02
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Display Dimming Pulse Width Modulation (PWM) Output Circuit Short to Ground
DTC B2625 04
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Display Dimming Pulse Width Modulation (PWM) Output Circuit Open
Diagnostic Fault Information
Circuit/System Description
The radio receives display dimming level information from the BCM via serial data. The radio supplies a pulse width modulated signal to the information display to control the display dimming level.
Conditions for Running the DTC
* Ignition ON.
* Radio ON.
* Exterior lighting ON.
Conditions for Setting the DTC
The radio detects a short to ground, short to voltage or an open on the display dimming control circuit.
Action Taken When the DTC Sets
The radio sets the DTC and continues to output the desired dimming level signal.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Navigation System Description and Operation Navigation System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Ignition ON, Radio ON, exterior lights ON, vary the interior lamp dimming switch from dim to bright. The navigation display brightness should vary from dim to bright.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 harness connector at the P17 info display module.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition ON, radio ON, verify a test lamp illuminates between the remote enable signal circuit terminal 6 and ground.
• If the test lamp does not illuminate, test the remote enable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
5. Lights ON, set the dimming switch to full bright. Test for 1-1.5 V on the display dimming control circuit terminal 3.
• If less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
• If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
6. Use the dimming switch to decrease the dimming level to full dim. Verify the voltage increases steadily to 6-7 V at full dim.
• If less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
• If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
7. If all circuits test normal, replace the P17 info display module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Driver Information Display Replacement (UDN) Driver Information Display Replacement (UDN)Driver Information Display Replacement (UAG) Driver Information Display Replacement (UAG)
* Control Module References Programming and Relearning for radio replacement, setup, and programming