Pinpoint Test F: DTCs C1279, C1280, C1281, C1282, C1516, C1517, C2769 And C2770
Anti-Lock Control
Pinpoint Tests
Pinpoint Test F: DTCs C1279, C1280, C1281, C1282, C1516, C1517, C2769 and C2770
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
The accelerometer (lateral and longitudinal) and the yaw rate sensor are contained in the stability control sensor cluster. The sensor cluster measures the vehicle acceleration and yaw rate, then sends the signal along a secondary Controller Area Network 2 (CAN2) bus to the ABS module, circuits VCA23 (BU/WH) and VCA24 (GN/OG). Fused ignition voltage is supplied to the sensor cluster by Smart Junction Box (SJB) fuse 35 (10A) along circuit CBP35 (YE/GY). Ground for the sensor cluster is provided along circuit GD151 (BK/GN).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Stability control sensor cluster
PINPOINT TEST F: DTCs C1279, C1280, C1281, C1282, C1516, C1517, C2769 and C2770
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
NOTE: The yaw rate sensor, roll-rate sensor, lateral accelerometer and longitudinal accelerometer are integral to the stability control sensor cluster.
NOTE: Make sure the vehicle is sitting on level ground, at a complete standstill and is not on a hoist before calibrating the stability control sensor cluster or carrying out this pinpoint test. Any vehicle movement will result in false values for this test.
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F1 CARRY OUT THE CALIBRATION PROCEDURE
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IVD Initialization Sequence.
- Carry out the IVD Initialization sequence following the scan tool directions.
- Test drive the vehicle.
- Retrieve and record any ABS module DTCs.
- Are any DTCs retrieved or does the IVD Initialization sequence indicate a fault?
Yes
GO to F2.
No
The system is operating correctly. The condition may have been caused by an incomplete or inaccurate stability control sensor cluster calibration.
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F2 CHECK THE SENSOR CLUSTER MOUNTING AND MOUNTING SURFACE
NOTE: The sensor cluster is located on the RH side of the vehicle, under the rear seat.
- Ignition OFF.
- Inspect the sensor cluster mounting and make sure that the nuts are fully seated and tightened correctly. Inspect the mounting surface for damage, corrosion or dirt.
- Were the sensor cluster nuts tightened incorrectly or a significant amount of corrosion or dirt found or the mounting surface damaged?
Yes
CLEAN and TIGHTEN the nuts to correct specification. CLEAN or REPAIR the mounting surface as necessary. CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
No
GO to F3.
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F3 CHECK THE VOLTAGE TO THE SENSOR CLUSTER
- Disconnect: Stability Control Sensor Cluster C3037.
- Ignition ON.
- Measure the voltage between the sensor cluster C3037-2, circuit CBP35 (YE/GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to F4.
No
VERIFY SJB fuse 35 (10A) is OK. If OK, REPAIR circuit CBP35 (YE/GY).
If the fuse is not OK, Refer to the Wiring Diagrams to identify the possible cause of the circuit short. Diagrams By Number
CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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F4 CHECK CIRCUIT GD151 (BK/GN) FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the sensor cluster C3037-5, circuit GD151 (BK/GN), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to F5.
No
REPAIR circuit GD151 (BK/GN). CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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F5 CHECK CIRCUITS VCA23 (BU/WH) AND VCA24 (GN/OG) FOR AN OPEN
NOTE: The battery and battery tray need to be removed to access the ABS module connector.
- Disconnect: ABS Module C135.
- Measure the resistance between ABS module C135, harness side and stability control sensor cluster C3037, harness side as indicated in the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to F6.
No
REPAIR the affected circuit(s). CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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F6 CHECK CIRCUITS VCA23 (BU/WH) AND VCA24 (GN/OG) FOR A SHORT TO GROUND
- Measure the resistance between ground and:
- stability control sensor cluster C3037-3, circuit VCA23 (BU/WH), harness side.
- stability control sensor cluster C3037-4, circuit VCA24 (GN/OG), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to F7.
No
REPAIR the affected circuit(s). CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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F7 CHECK CIRCUITS VCA23 (BU/WH) AND VCA24 (GN/OG) FOR A SHORT TOGETHER
- Measure the resistance between stability control sensor cluster C3037-3, circuit VCA23 (BU/WH), harness side and stability control sensor cluster C3037-4, circuit VCA24 (GN/OG), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to F8.
No
REPAIR the affected circuit(s). CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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F8 CHECK CIRCUITS VCA23 (BU/WH) AND VCA24 (GN/OG) FOR A SHORT TO VOLTAGE
NOTE: The battery must be connected to carry out this test.
- Ignition ON.
- Measure the voltage between ground and:
- stability control sensor cluster C3037-3, circuit VCA23 (BU/WH), harness side.
- stability control sensor cluster C3037-4, circuit VCA24 (GN/OG), harness side.
- Is any voltage present?
Yes
REPAIR the affected circuit(s). CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
No
INSTALL a new sensor cluster. REFER to Stability Control Sensor Cluster Service and Repair. CLEAR the DTCs. CALIBRATE the ABS module. FOLLOW the scan tool directions for the IVD Initialization sequence. REPEAT the self-test.
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