FixVault
Home › Chrysler › 1999 › LHS › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Self-Diagnostic Tests › DTC P0703-A: Brake Switch Sense Circuit

DTC P0703-A: Brake Switch Sense Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Turn ignition off. Disconnect brake switch connector. Turn ignition on. Using a voltmeter, check voltage of brake switch sense circuit at brake switch connector. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION  table. If voltage is more than 9 volts, go to next step. If voltage is 9 volts or less, go to step  4.
  2. Observe brake switch status on scan tool. Connect a jumper wire from brake switch sense circuit to ground. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION  table. If scan tool display changed from PRESSED to RELEASED, replace brake switch. Perform TEST VER-2A: ROAD TEST VERIFICATION . If scan tool display did not change, go to next step.
  3. Using a ohmmeter, check resistance of ground circuit between brake switch connector and ground. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  4. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for pushed out terminals or damage. Repair PCM connector as necessary. Perform TEST VER-2A: ROAD TEST VERIFICATION . If PCM connector is okay, go to next step.
  5. Using a ohmmeter, check resistance of brake switch sense circuit between PCM connector terminal No. 50 and brake switch connector. See BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION  table and PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open brake switch sense circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  6. Using a ohmmeter, check resistance of brake switch sense circuit between PCM connector terminal No. 62 and ground. See PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, repair short to ground on brake switch sense circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A: ROAD TEST VERIFICATION .
BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Brake Switch Sense Circuit White/Pink
Brake Switch Ground Circuit Black/Light Green
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 50 Ground Circuit Black/Tan
PCM Terminal No. 62 Brake Switch Sense Circuit White/Pink
About FixVault