LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC C0870 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections .

DTC C0870

Step Action Yes No
Schematic Reference: Exterior Lights Schematics 
Connector End View Reference: Master Electrical Component List
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Brake Pedal Position Sensor parameter in the data list for the body control module (BCM).
  4. Apply and release the brake pedal.
Does the scan tool display a change in the voltage?		 Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect the BCM harness connector C1.
  3. At the BCM harness connector C1, connect a test lamp between the brake pedal sensor voltage reference circuit and ground.
Does the test light illuminate?		 Go to Step 4  Go to Step 5 
4 Test for a short to battery positive voltage in the brake pedal position sensor voltage reference circuit. Refer to Circuit Testing andWiring Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 6 
5 Test for a short to ground on the brake pedal position sensor reference voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 6 
6 Inspect for a high resistance or a poor connection at the harness connector of the brake pedal position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
7
IMPORTANT: After replacing the brake pedal position sensor, perform the calibration procedure. Refer to Brake Pedal Position Sensor Calibration .
Replace the brake pedal position sensor. Refer to Brake Pedal Position Sensor Replacement .Did you complete the replacement?		 Go to Step 8  -
8
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Apply and release the brake pedal.
Does DTC C0870 reset?		 Go to Step 9  Go to Step 11 
9 Inspect for a high resistance or a poor connection at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
10 Replace the BCM. Refer to Control Module References for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 Go to Step 2  System OK
scientia non olet · About LEMON Manuals