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DTC P0703: Brake Switch Sense Circuit: Testing

  1. Turn ignition on. Using scan tool, check for DTCs. If Good Trip counter is displayed for DTC P0703 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P0703 or displayed count is not "0", go to step  9.
  2. Turn ignition off. Disconnect brakelight switch connector. Brakelight switch is located near top of brake pedal. Using a test light connected to ground, probe Gray/Red wire at brakelight switch harness connector. If test light is illuminated brightly, go to next step. If test light is not illuminated brightly, repair open or high resistance is power circuit (Gray/Red wire) to brakelight switch.
  3. Ensure ignition is off. Disconnect PCM connectors. PCM is located on left side of engine compartment. Remove Auto Shutdown (ASD) relay. ASD relay is located in Integrated Power Module (IPM). IPM is located on left side of engine compartment, next to battery. Connect a jumper wire between terminals No. 30 and 87 at ASD relay socket in IPM. Turn ignition on. Measure voltage between ground and Dark Green/White wire at brakelight switch harness connector. If voltage is one volt or less, go to next step. If voltage is more than one volt, repair short to voltage in Dark Green/White wire.
    NOTE: The Intelligent Power Module (IPM) may also be referred to as Integrated Power Module (IPM) or Power Distribution Center (PDC).
  4. Turn ignition off. Measure resistance between ground and Dark Green/White wire at brakelight switch harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Green/White wire between brakelight switch and PCM.
  5. Measure resistance of Dark Green/White wire between brakelight switch harness connector and terminal No. 62 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Green/White wire.
  6. Measure resistance between ground and Black/Orange wire at brakelight switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Orange wire.
  7. Measure resistance between terminals No. 5 and 6 at brakelight switch. Depress and release brake pedal and note resistance reading. Resistance should be less than 5 ohms with brake pedal released and infinity (open) with brake pedal depressed. If resistance is as specified, go to next step. If resistance is not as specified, replace brakelight switch.
  8. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  9. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
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