Pinpoint Tests AB: The PRNDL Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AB: The PRNDL Indicator is Never/Always On
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
The Instrument Panel Cluster (IPC) receives the transmission range status from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The IPC also uses a park detect switch (part of the brake shift interlock) to signal the IPC that the shift lever is fully seated in the PARK position. The IPC compares the park detect switch input with the transmission range status sent from the PCM. The IPC provides a reference voltage to the brake shift interlock on circuit CET52 (GN). When the gearshift is in PARK (P), the brake shift indicator routes the reference voltage to ground, pulling the circuit low to the IPC. When the gearshift is moved out of PARK (P), the brake shift interlock opens the ground sending the reference voltage high. If the PRNDL information is missing from the PCM, the IPC sets DTC U0100:00.
NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, tachometer, temperature gauge or odometer.
- DTC P1706:00 (High Vehicle Speed Observed In Park) - a continuous memory DTC that sets if the IPC detects a short to ground on the park detect switch input, circuit CET53 (BU/OG), pulling the circuit low with a Vehicle Speed Sensor (VSS) input over 16 km/h (10 mph), indicating that the vehicle is in motion.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Park detect switch (part of the selector lever)
- PCM
- IPC
PINPOINT TEST AB: THE PRNDL INDICATOR IS NEVER/ALWAYS ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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AB1 CHECK THE PRNDL DISPLAY PARK OPERATION
- Ignition ON.
- Shift the selector lever through the different gear positions while observing the PRNDL display.
- Place the selector lever in the PARK (P) position.
- Observe the PRNDL display.
- Does the PRNDL display the different ranges according to the selector lever position?
Yes
The system is functioning correctly at this time.
No
GO to AB2.
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AB2 RETRIEVE THE RECORD DTCs FROM THE IPC SELF-TEST
- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?
Yes
For all DTCs, CLEAR the DTCs. DRIVE the vehicle above 16 km/h (10 mph) for more than 5 seconds. REPEAT the self-test.
If DTC U0100:00 returns, Go To Pinpoint Test AO. Pinpoint Tests AO: DTC U0100:00
If DTC P1706:00 returns, GO to AB4.
No
GO to AB3.
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AB3 RETRIEVE AND RECORD THE DTCs FROM THE PCM KOEO SELF-TEST
- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any PCM DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to AB4.
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AB4 CHECK THE PARK DETECT INPUT TO THE IPC
- Ignition OFF.
- Disconnect: Selector Lever C3245.
- Install a fused jumper wire between the selector lever C3245-3, circuit CET52 (GN), harness side and ground.
- Ignition ON.
- Monitor the PRNDL indicator with the jumper wire installed and with the jumper wire removed.
- Does the PRNDL display P with the jumper wire installed and blank with the jumper wire removed?
Yes
INSTALL a new selector lever. TEST the system for normal operation.
No
GO to AB5.
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AB5 CHECK CIRCUIT CET52 (GN) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: IPC C220.
- Measure the resistance between the IPCC220-7, circuit CET52 (GN), harness side and the selector lever C3245-3, circuit CET52 (GN), harness side; and between the IPC C220-7, circuit CET52 (GN), harness side and ground.
- Is the resistance less than 5 ohms between the IPC and the selector lever, and greater than 10,000 ohms between the IPC and ground?
Yes
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
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