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Home › Jeep › 1998 › Wrangler SE, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - Engine Performance › Self-Diagnostic Tests › Test NTC-16A: Checking Brake Switch

Test NTC-16A: Checking Brake Switch

NOTE: This test does not apply to AN, BE/BR and DN bodies. For connector terminal identification, see CONNECTOR IDENTIFICATION . For component location and wiring diagram, see WIRING DIAGRAMS article.
  1. On AB body, go to next step. On all other bodies, use scan tool to read brake switch input while pressing and releasing brake pedal. If scan tool reading does not correspond to position of brake pedal (PRESSED or RELEASED), replace brake switch and perform TEST VER-2A: ROAD TEST VERIFICATION . If scan tool reading corresponds to position of brake pedal, brake switch is functioning properly. Test passed.
  2. If vehicle is not equipped with Speed Control (S/C), go to step 5)  . If vehicle is equipped with S/C, ensure brake pedal is not pressed and go to next step.
  3. Turn ignition on, engine off. Using scan tool, actuate S/C solenoids. Using a 12-volt test light, backprobe brakelight connector, S/C brake switch output circuit (Dark Blue/Red wire). Press brake pedal. If test light goes off when brake pedal is pressed and comes on when pedal is released, go to step 5)  . If test light does not go off when pedal is pressed and come on when pedal is released, go to next step.
  4. Check brake switch adjustment. Adjust brake switch as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If brake switch adjustment is okay, replace brake switch and perform TEST VER-2A: ROAD TEST VERIFICATION .
  5. Using a 12-volt test light, backprobe brakelight connector, fused B+ circuit (Pink/Dark Blue wire). If test light does not come on, repair open fused B+ circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If test light comes on, go to next step.
  6. Backprobe brakelight connector, S/C brake switch output circuit (Dark Blue/Red wire). Press brake pedal. If test light goes off when brake pedal is pressed and comes on when pedal is released, go to step 8)  . If test light does not go off when pedal is pressed and come on when pedal is released, go to next step.
  7. Check brake switch adjustment. Adjust brake switch as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If brake switch adjustment is okay, replace brake switch and perform TEST VER-2A: ROAD TEST VERIFICATION .
  8. Using scan tool, read brake switch input while pressing and releasing brake pedal. If scan tool reading does not correspond to position of brake pedal (PRESSED or RELEASED), go to next step. If scan tool reading corresponds to position of brake pedal, brake switch is functioning properly. Test passed. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  9. Disconnect brake switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connector and terminals are okay, go to next step.
  10. Connect a jumper wire between ground and brakelight switch connector, brake switch sense circuit (White/Pink wire). Using scan tool, read brake switch status. If scan tool displays RELEASED, replace brake switch and perform TEST VER-2A: ROAD TEST VERIFICATION . If scan tool does not display RELEASED, go to next step.
  11. Using an external ohmmeter, check resistance between ground and brakelight switch connector, ground circuit (Black wire). If resistance is 5 ohms or more, repair open ground circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, go to next step.
  12. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-2A: ROAD TEST VERIFICATION . If connectors and terminals are okay, go to next step.
  13. Check resistance of brake switch sense circuit (White/Pink wire) between PCM Gray connector and brakelight switch connector. If resistance is 5 ohms or more, repair open brake switch sense circuit and perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is less than 5 ohms, replace PCM and perform TEST VER-2A: ROAD TEST VERIFICATION .
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