Pinpoint Test AE: The Trip Computer Switch Is Inoperative
Instrumentation, Message Center and Warning Chimes
Pinpoint Test AE: The Trip Computer Switch Is Inoperative
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information Electrical Diagrams.
Normal Operation
The trip computer switch is a redundant switch used to control the functions in the integrated circuit display such as trip computer. The trip computer switch is located in the multifunction switch and hardwired directly to the Instrument Panel Cluster (IPC) through a single signal circuit with a ground provide through a separate circuit. When the driver presses the trip computer button, the switch closes to ground. The IPC (Instrument Panel Cluster) detects the change in button state and carries out the chosen function of the integrated display.
- DTC B10BD:01 (Multifunctional Switch: General Electrical Failure)- sets on-demand in the IPC (Instrument Panel Cluster) when the IPC (Instrument Panel Cluster) detects a short to ground on the trip computer switch signal circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Message center switch
- IPC (Instrument Panel Cluster)
PINPOINT TEST AE : THE TRIP COMPUTER SWITCH IS INOPERATIVE
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed results in false resistance readings.
AE1 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST
- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.
Are any DTCs recorded?
Yes
For DTC B10BD:01, GO to AE6.
For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.
No
GO to AE2.
AE2 CHECK THE TRIP COMPUTER SWITCH OPERATION
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.
- Select the IPC (Instrument Panel Cluster) trip computer switch PID (EXT_TRIP_SW).
- Monitor the PID display while pressing the trip computer switch button.
Does the PID display ON when the button is pressed and OFF when the button is released?
Yes
GO to AE3.
No
GO to AE4.
AE3 RETRIEVE THE RECORDED DTCs FROM THE FCDIM (Front Control/Display Interface Module) SELF-TEST
- Check for recorded DTCs from the FCDIM (Front Control/Display Interface Module) self-test.
Is DTC U0155:00 recorded?
Yes
REFER to Accessories and Optional Equipment.
No
INSTALL a new FCDIM (Front Control/Display Interface Module). TEST the system for normal operation.
AE4 CHECK THE TRIP COMPUTER SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: IPC (Instrument Panel Cluster) C220.
- Ignition ON.
- Measure the voltage between the IPC (Instrument Panel Cluster) C220-30, circuit RMC27 (WH/BN), harness side and ground.
Is any voltage present?
Yes
REPAIR circuit RMC27 (WH/BN) for a short to voltage. TEST the system for normal operation.
No
GO to AE5.
AE5 CHECK THE TRIP COMPUTER SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Multifunction Switch C202A.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-30, circuit RMC27 (WH/BN), harness side and the multifunction switch C202A-3, circuit RMC27 (WH/BN), harness side.
Is the resistance less than 5 ohms?
Yes
GO to AE7.
No
REPAIR circuit RMC27 (WH/BN) for an open. TEST the system for normal operation.
AE6 CHECK THE TRIP COMPUTER SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Multifunction Switch C202A.
- Measure the resistance between the IPC (Instrument Panel Cluster) C220-30, circuit RMC27 (WH/BN), harness side and ground.
Is the resistance greater than 10,000 ohms?
Yes
GO to AE7.
No
REPAIR circuit RMC27 (WH/BN) for a short to ground. TEST the system for normal operation.
AE7 CHECK THE TRIP COMPUTER SWITCH INPUT TO THE IPC (Instrument Panel Cluster)
- Connect: Multifunction Switch C202A.
- Disconnect: Negative Battery Cable.
- While pressing and releasing the trip computer switch, measure the resistance between the IPC (Instrument Panel Cluster) C220-30, circuit RMC27 (WH/BN), harness side and ground.
Is the resistance less than 5 ohms with the trip computer button pressed and greater then 10,000 ohms with the trip computer button released?
Yes
GO to AE8.
No
INSTALL a new multifunction switch. CLEAR the DTC. REPEAT the self-test.
AE8 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION
- Disconnect the IPC (Instrument Panel Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC (Instrument Panel Cluster) connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.