Pinpoint Tests AE: The PRNDL Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AE: 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 Transmission Control Module (TCM) (part of the PCM) over the High Speed Controller Area Network (HS-CAN) communication bus. The IPC also uses a brake shift interlock to signal the IPC that the shift lever is fully seated in the PARK position. The IPC compares the brake shift interlock 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 interlock 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 or invalid from the TCM, the IPC sets DTC U0101:00 and defaults the PRNDL display to off (blank).
- 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 brake shift interlock input, circuit CET52 (GN), 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
- Brake shift interlock
- PCM concern
- IPC
PINPOINT TEST AE: 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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AE1 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.
- Ignition OFF.
- Observe the PRNDL display.
- Does the PRNDL display the different ranges according to the selector lever position then display P for approximately 5 seconds when the key is turned off?
Yes
The system is functioning correctly at this time.
No
GO to AE2.
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AE2 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 U0101:00 returns, Go To Pinpoint Test AT. Pinpoint Tests AT: DTC U0100:00
If DTC P1706:00 returns, GO to AE4.
No
GO to AE3.
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AE3 RETRIEVE AND RECORD THE DTCs FROM THE TCM SELF-TEST
- Check for recorded TCM DTCs from the self-test.
- Are any TCM DTCs recorded?
Yes
REFER to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart
No
GO to AE4.
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AE4 CHECK THE PARK DETECT INPUT TO THE IPC
- Ignition OFF.
- Disconnect: Brake Shift Interlock C2375.
- Install a fused jumper wire between the brake shift interlock C2375-1, 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 brake shift interlock. TEST the system for normal operation.
No
GO to AE5.
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AE5 CHECK CIRCUIT CET52 (GN) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: IPC C220.
- Measure the resistance between the IPCC220-14, circuit CET52 (GN), harness side and the brake shift interlock C2375-1, circuit CET52 (GN), harness side; and between the IPC C220-14, 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
GO to AE6.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
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AE6 CHECK FOR CORRECT IPC OPERATION
- Disconnect all the IPC connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the IPC connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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