Pinpoint Test K: DTC C1408/C1409: PARKING BRAKE APPLY/RELEASE SWITCH CIRCUIT OUT OF RANGE

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If DTC C1408 is retrieved, go to Step 1. If DTC C1409 is retrieved, go to Step 2.

K1 CHECK THE PARKING BRAKE SWITCH APPLY/RELEASE OUTPUT
- Measure the voltage between the electronic parking brake (EPB) switch C3218-8, circuit 8-CG15 (WH/BU), harness side and the EBP switch C3218-5, circuit 9-CG15 (BN/BU), harness side while pulling the EPB switch up from its rest position.
  
  Fig 1: Measuring EPB Switch C3218-8, Circuit 8-CG15 (WH/BU), Harness Side And EBP Switch C3218-5, Circuit 9-CG15 (BN/BU), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the voltage between the EPB switch C3218-4, circuit 10-CG15 (GY/VT), harness side and the EBP switch C3218-5, circuit 9-CG15 (BN/BU), harness side while pushing the EPB switch down from its rest position.
  
  Fig 2: Measuring Voltage Between EPB Switch C3218-4, Circuit 10-CG15 (GY/VT), Harness Side And EBP Switch C3218-5, Circuit 9-CG15 (BN/BU), Harness Side
  Courtesy of FORD MOTOR CO.
- Do the voltages change from 3.5-4.5 volts (idle range) to 1.5-3.0 volts (switch active range)
- Yes : If the EPB switch apply voltage is within range, GO to K2.
  If the EPB switch release voltage is within range, GO to K3.
- No : INSTALL a new EPB switch. REFER to PARKING BRAKE SWITCH in this article . RESET the parking brake system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article . CLEAR the DTCs. REPEAT the self-test.
K2 CHECK CIRCUIT 8-CG15 (WH/BU) FOR AN OPEN
- Disconnect the battery. Refer to CHARGING SYSTEM - GENERAL INFORMATION .
- Disconnect: EPB Switch C3218.
- Disconnect: EPB Module C4205b.
- Measure the resistance between the EPB switch C3218-8, circuit 8-CG15 (WH/BU), harness side and the EPB module C4205b-5, circuit 8-CG15 (WH/BU), harness side.
  
  Fig 3: Measuring Resistance Between EPB Switch C3218-8, Circuit 8-CG15 (WH/BU), Harness Side And EPB Module C4205b-5, Circuit 8-CG15 (WH/BU), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms
- Yes : INSTALL a new EPB switch. REFER to PARKING BRAKE SWITCH in this article . RESET the parking brake system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article . CLEAR the DTCs. REPEAT the self-test.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .
K3 CHECK CIRCUIT 10-CG15 (GY/VT) FOR AN OPEN
- Disconnect: EPB Switch C3218.
- Disconnect: EPB Module C4205b.
- Measure the resistance between the EPB switch C3218-4, circuit 10-CG15 (GY/VT), harness side and the EPB module C4205b-6, circuit 10-CG15 (GY/VT) harness side.
  
  Fig 4: Measuring Resistance Between EPB Switch C3218-4, Circuit 10-CG15 (GY/VT), Harness Side And EPB Module C4205b-6, Circuit 10-CG15 (GY/VT) Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms
- Yes : INSTALL a new EPB module. REFER to PARKING BRAKE MODULE in this article . CLEAR the DTCs. REPEAT the self-test. RESET the EPB system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. RESET the parking brake system. REFER to ELECTRONIC PARKING BRAKE (EPB) RESETTING in this article .