Chevrolet Trax: Onstar button led malfunction
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
DTC B2476 04
Cellular Phone Select Service Switch Open
DTC B2476 59
Cellular Phone Select Service Switch Protection Time-out
Cellular Phone Select Service Switch Protection Time-out
Cellular Phone Select Service Switch Range/Performance
Diagnostic Fault Information
Circuit Description
The OnStar status LEDs are located in the inside rearview mirror telematic
button assembly. The green LED
is illuminated when the system is ON and operating normally. When the green LED
is green and flashing, it is
an indication that a call is in progress. When the red LED is illuminated, a
system malfunction is present. In the
event there is a system malfunction and the OnStar system is still able to make
a call, the LED will flash red
during the call. The OnStar LEDs are controlled by the telematics communication
interface control module
via the keypad green LED control circuit and the keypad red LED control circuit.
Conditions for Running the DTC
- Ignition ON.
- Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
B2476 04
The telematics communication interface control module detects a short to
voltage or an open/high resistance on
the keypad 10 V reference circuit.
B2482 and B2476 59
The telematics communication interface control module detects a valid signal
on the keypad signal circuit for
longer than 15 s. If one of the OnStar buttons is held or stuck for 15 s or
greater, the telematics
communication interface control module will set this DTC.
Action Taken When the DTC Sets
- The OnStar status LED turns red.
- No calls can be placed.
- The telematics communication interface control module will ignore all
inputs from the OnStar button
assembly.
Conditions for Clearing the DTC
- The condition responsible for setting the DTC no longer exists.
- A history DTC will clear once 50 consecutive malfunction-free ignition
cycles have occurred.
Reference Information
Schematic Reference
OnStar/Telematics Schematics (Encore), OnStar/Telematics Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS -
INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT
CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
OnStar Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
NOTE: If the green LED is off with the ignition ON and the LED does
not function when
commanded with the scan tool, contact the OnStar Center to confirm the
vehicle has a current subscription.
- Ignition ON.
- Verify no DTC are set.
Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Verify that the green LED turns ON and OFF when commanding the Green
Indicator ON and OFF with a
scan tool.
- If the green LED does not turn ON and OFF
Refer to Circuit/System Testing - Green LED Test
- If the green LED turns ON and OFF
- Verify that the red LED turns ON and OFF when commanding the Red
Indicator ON and OFF with a
scan tool.
- If the red LED does not turn ON and OFF
Refer to Circuit/System Testing - Red LED Test
- If the red LED turns ON and OFF
- All OK.
Circuit/System Testing
Green LED Test
- Ignition OFF, and all vehicle systems OFF, disconnect the harness
connector at the A10 Inside Rearview
Mirror. It may take up to 2 min for all vehicle systems to power down. Doors
closed, courtesy lamps
OFF.
- Test for less than 10 ohms between the ground circuit terminal 5 and
ground.
If 10 ohms or greater
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
If less than 10 ohms
- Ignition ON.
- Test for less than 1 V between the control circuit terminal 6 and ground
while commanding the Green
Indicator OFF with a scan tool.
If 1 V or greater
- Ignition OFF, disconnect the X1 harness connector at the K73 Telematics
Communication Interface
Control Module, ignition ON.
- Test for less than 1 V between the control circuit terminal 6 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K73 Telematics Communication Interface
Control Module.
If less than 1 V
- Test for greater than 8 V between the control circuit terminal 6 and
ground while commanding the Green
Indicator ON with a scan tool.
If 8 V or less
- Ignition OFF, disconnect the X1 harness connector at the K73 Telematics
Communication Interface
Control Module.
- Test for infinite resistance between the control circuit terminal 6 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K73 Telematics Communication Interface
Control Module.
If greater than 8 V
- Test or replace the A10 Inside Rearview Mirror.
Red LED Test
- Ignition OFF, and all vehicle systems OFF, disconnect the harness
connector at the A10 Inside Rearview
Mirror. It may take up to 2 min for all vehicle systems to power down. Doors
closed, courtesy lamps
OFF.
- Test for less than 10 ohms between the ground circuit terminal 5 and
ground.
If 10 ohms or greater
- Ignition OFF.
- Test for less than 2 ohms in the ground circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, repair the open/high resistance in the ground
connection.
If less than 10 ohms
- Ignition ON.
- Test for less than 1 V between the control circuit terminal 7 and ground
while commanding the Red
Indicator OFF with a scan tool.
If 1 V or greater
- Ignition OFF, disconnect the X1 harness connector at the K73 Telematics
Communication Interface
Control Module, ignition ON.
- Test for less than 1 V between the control circuit terminal 7 and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the K73 Telematics Communication Interface
Control Module.
If less than 1 V
- Test for greater than 8 V between the control circuit terminal 7 and
ground while commanding the Red
Indicator ON with a scan tool.
If 8 V or less
- Ignition OFF, disconnect the X1 harness connector at the K73 Telematics
Communication Interface
Control Module.
- Test for infinite resistance between the control circuit terminal 7 and
ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- Test for less than 2 ohms in the control circuit end to end.
- If 2 ohms or greater, repair the open/high resistance in the circuit.
- If less than 2 ohms, replace the K73 Telematics Communication Interface
Control Module.
If greater than 8 V
- Test or replace the A10 Inside Rearview Mirror.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Inside Rearview Mirror Replacement
- Control Module References for telematics communication interface control
module replacement,
programming and setup.
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Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
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approach.
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Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
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Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
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(Mexico) or Airbag
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inflate if the impact exceeds the
specific airbag system's deployment
threshold. Deployment thresholds
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Fig. 314: Crankshaft Position Sensor, Bolt And Seal Ring
Remove the crankshaft position sensor bolt (3).
Remove the crankshaft position sensor (1) and the crankshaft position
sensor seal ring (2).
Fig. 315: Outer Crankshaft Bearing Cap Tie Plate Bolts
Remove and DISCARD the 12 outer cran