Test Description

The numbers below refer to the step numbers on the diagnostic table.

DTC C1279

Step	Action	Value(s)	Yes	No
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Disconnect the yaw rate sensor connector. Turn ON the ignition, with the engine OFF. Measure the voltage of the sensor voltage circuit to a good ground. Refer to Circuit Testing and Wiring Repairs . Is the voltage within the specified range?	10-14 V	Go to Step 5	Go to Step 3
3	Test the sensor voltage circuit for the following: An open High resistance Short to ground Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 7	Go to Step 4
4	Test the sensor ground circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 7	Go to Step 5
5	Replace the yaw rate sensor. Refer to Yaw Rate Sensor Replacement . Did you complete the replacement?	-	Go to Step 7	-
6	Replace the brake pressure modulator valve (BPMV). Refer to Brake Modulator Assembly Replacement (With VSC) or Brake Modulator Assembly Replacement (Without VSC) . Did you complete the replacement?	-	Go to Step 7	-
7	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK