DTC P0703-A: BRAKE SWITCH SENSE CIRCUIT Chrysler LHS II

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»(ref-576-S15114064592000030800000) 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»(ref-576-S15114064592000030800000) table. If scan tool display changed from PRESSED to RELEASED, replace brake switch. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . 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»(ref-576-S15114064592000030800000) table. If resistance is less than 5 ohms, replace PCM. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . If resistance is 5 ohms or more, repair open ground circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .
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»(ref-576-S22124556262000030800000) . 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»(ref-576-S15114064592000030800000) table and «PCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S19681473182000030800000) 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»(ref-576-S22124556262000030800000) .
6. Using a ohmmeter, check resistance of brake switch sense circuit between PCM connector terminal No. 62 and ground. See «PCM CONNECTOR WIRE IDENTIFICATION»(ref-576-S19681473182000030800000) table. If resistance is less than 5 ohms, repair short to ground on brake switch sense circuit. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) . If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-2A: ROAD TEST VERIFICATION»(ref-576-S22124556262000030800000) .

BRAKE SWITCH CONNECTOR WIRE IDENTIFICATION

PCM CONNECTOR WIRE IDENTIFICATION