Pinpoint Tests AA: The PRNDL Indicator Is Never/Always On
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AA: The PRNDL Indicator is Never/Always On
Normal Operation
The Instrument Cluster (IC) receives the transmission range status from the Transmission Control Module (TCM) when equipped with a diesel engine or from the PCM when equipped with a gasoline engine over the High Speed Controller Area Network (HS-CAN) communication bus. The IC also uses a park detect switch (part of the brake shift interlock) to signal the IC that the shift lever is fully seated in the park position. The IC compares the park detect switch input with the transmission range status sent from the PCM or TCM and looks for vehicle speed above 16 km/h (10 mph). The IC 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 IC. 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 or TCM, the IC sets DTC U0100 (PCM) or U0101 (TCM).
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, tachometer, temperature gauge or odometer.
- DTC C1170 (PRNDL Switch Circuit Failure) - a continuous memory DTC that sets if the IC receives a transmission range other than PARK (P) and detects a short to ground on the park detect switch 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
- Brakeshift interlock
- PCM concern
- TCM concern
- IC
PINPOINT TEST AA: 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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AA1 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 immediately after turning the key off.
- 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 AA2.
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AA2 RETRIEVE AND RECORD THE IC DTCs FROM THE SELF-TEST
- Check for recorded IC DTCs from the 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 C1170 is present, GO to AA5.
If DTC B1318 is present, Go To Pinpoint Test BC. Pinpoint Tests BC: DTC B1318
If DTC U0100 is present, Go To Pinpoint Test BE. Pinpoint Tests BE: DTC U0100
If DTC U0101 is present, Go To Pinpoint Test BF. Pinpoint Tests BF: DTC U0101
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
For gasoline engines, GO to AA3.
For diesel engine, GO to AA4.
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AA3 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 AA8.
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AA4 RETRIEVE AND RECORD THE DTCs FROM THE TCM SELF-TEST
- Check for recorded TCM DTCs from the self-test.
- Are any DTCs recorded?
Yes
REFER to Transmission Control Systems. Testing and Inspection
No
GO to AA8.
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AA5 CARRY OUT THE IC DEALER TEST MODE
NOTE: After exiting a dealer test mode session, it is necessary to clear all IC DTCs. Carry out the IC self-test.
- Ignition ON.
- Verify that the transmission selector lever is fully seated in the PARK (P) position.
- NOTE: The display below uses xxx's to represent a text display. The text display indicates ACTIVE when the IC detects that the selector lever is in PARK (P) or INACTIVE when the IC detects that selector lever is out of PARK (P).
- Enter the IC dealer test mode. Scroll through the displays until HW PARK DETCTN SW = xxxxxxxx is displayed and note the park detect switch status.
- Does the self-test indicate ACTIVE?
Yes
GO to AA6.
No
GO to AA7.
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AA6 CHECK THE BRAKE SHIFT INTERLOCK OPERATION
- Apply the park brake and shift the transmission into NEUTRAL (N).
- Ignition OFF.
- Disconnect: Brake Shift Interlock C2008.
- Ignition ON.
- Clear the DTCs. DRIVE the vehicle above 16 km/h (10 mph) for more than 5 seconds. Retrieve the IC continuous memory DTCs.
- Is DTC C1170 still present?
Yes
GO to AA7.
No
INSTALL a new brake shift interlock. TEST the system for normal operation.
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AA7 CHECK CIRCUIT CET52 (GN) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Disconnect: IC C220.
- Disconnect: Brake Shift Interlock C2008.
- Measure the resistance between the IC C220-14, circuit CET52 (GN), harness side and the brake shift interlock C2008-2, circuit CET52 (GN), harness side; and between the IC C220-14, circuit CET52 (GN), harness side and ground.
- Is the resistance less than 5 ohms between the IC and the brake shift interlock, and greater than 10,000 ohms between the IC and ground?
Yes
GO to AA8.
No
REPAIR the circuit. REPEAT the self-test. CLEAR the DTCs.
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AA8 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). 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.
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