DTC B2476 RHD
Diagnostic Instructions
DTC Descriptor
DTC B2476 00: Cellular Phone Select Switch
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Keypad Supply Voltage
| B2476 00
| B2476 00
| B2476 00
| --
|
Circuit/System Description
The telematics button assembly on the inside rearview mirror assembly consists of 3 buttons, Information/End Call, Holden Assist and Emergency. Ten volts is supplied to the button assembly on the keypad supply voltage circuit. Each of the
buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics module on the keypad signal circuit. Depending upon the voltage range returned, the telematics module is able to identify which button
has been pressed.
Conditions for Running the DTC
• | Battery voltage must be between 9-16 volts. |
Conditions for Setting the DTC
The communication interface module detects a short to voltage, short to ground, or an open/high resistance on the keypad supply voltage circuit.
Action Taken When the DTC Sets
• | No calls can be placed. |
• | The communication interface module commands the red LED ON. |
• | The communication interface module will ignore all inputs from the button assembly. |
Conditions for Clearing the DTC
• | The condition for setting the DTC is no longer present. |
• | The history DTC will clear after 100 fault-free ignition cycles. |
Reference Information
Schematic Reference
Telematics Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Telematics Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the inside rearview mirror.
- Test for less than 5 Ω between the mirror ground circuit terminal 8 and ground.
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Ignition ON, test for less than 1 V between the keypad signal circuit terminal 11 and ground.
⇒ | If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the communication interface module. |
- Ignition OFF, test for 600 K - 700 K Ω between the keypad signal circuit terminal 11 and ground.
⇒ | If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the communication interface module. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the communication interface module. |
- Ignition ON, test for 9.8-10.2 V between the keypad supply voltage circuit terminal 12 and ground.
⇒ | If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the communication interface module. |
⇒ | If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the communication interface module. |
- If all circuits test normal, test or replace the button assembly.
Component Testing
- Ignition OFF, disconnect the harness connector at the inside rearview mirror.
- Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11.
⇒ | If less than the specified range, replace the inside rearview mirror. |
- Test for 1.4 K - 1.6 K Ω between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the black phone button.
⇒ | If not within the specified range, replace the inside rearview mirror. |
- Test for 2.7 K - 3.3 K Ω between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the blue Holden Assist® button.
⇒ | If not within the specified range, replace the inside rearview mirror. |
- Test for 2.7 K - 3.3 K Ω between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the red emergency button.
⇒ | If not within the specified range, replace the inside rearview mirror. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.