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Home >> Jeep >> 1993 >> Wrangler Base, 2.5 P >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Test 22A >> Abs Warning Light Illumination Problem

Abs Warning Light Illumination Problem

  1. Using DRB-II, read ABS fault codes. If any fault codes are present, perform TEST 1A. Turn ignition off. Remove ABS main relay from PDC, and inspect connector. Repair connector as necessary. Turn ignition on. If ABS warning light comes on, go to next step. If warning light does not come on, perform VERIFICATION TEST VER-1C.
    NOTE: A main relay/power circuit failure fault will set with ABS main relay removed.
  2. Turn ignition off. With DRB-II in ohmmeter mode, probe Black/Tan ground wire (Black ground wire on Grand Cherokee and Grand Wagoneer) at ABS main relay socket. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Black/Tan ground wire (Black ground wire on Grand Cherokee and Grand Wagoneer). Perform VERIFICATION TEST VER-1A.
  3. Ensure ignition off. Disconnect and inspect CAB 55-pin connector. Repair connector as necessary. With DRB-II in voltmeter mode, probe Gray/Yellow wire (Gray/Pink wire on Grand Cherokee and Grand Wagoneer) at ABS main relay socket. If no voltage is present, go to next step. If any voltage is present, replace ABS main relay. Perform VERIFICATION TEST VER-1A.
  4. Remove ABS diode. Diode is taped to wiring harness, near CAB (near ABS 8-pin disconnect connector on Grand Cherokee and Grand Wagoneer). Connect a jumper wire between Gray/Yellow wire (Gray/Pink wire on Grand Cherokee and Grand Wagoneer) and Black/Tan wire (Black wire on Grand Cherokee and Grand Wagoneer) at ABS main relay socket terminals "B" and "E".
  5. Using DRB-II in ohmmeter mode, probe Gray/Yellow wire at ABS diode connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Gray/Yellow wire between relay splice and diode. Perform VERIFICATION TEST VER-1A.
  6. Remove jumper wire used in step 4). Turn ignition on. If ABS warning light does not come on, go to next step. If ABS warning light comes on, repair Violet wire (Violet/White wire on Grand Cherokee and Grand Wagoneer or Light Green/Orange on Wrangler) for a short circuit to ground between CAB connector terminal No. 52 and ABS diode.
  7. Turn ignition off. Connect a jumper wire between ground and Violet wire (Violet/White wire on Grand Cherokee and Grand Wagoneer or Light Green/Orange wire on Wrangler) at CAB connector terminal No. 52. Using DRB-II in ohmmeter mode, probe Violet wire (Violet/White wire on Grand Cherokee and Grand Wagoneer or Light Green/Orange wire on Wrangler) at ABS diode connector. If resistance is less than 5 ohms, replace ABS diode. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, repair open Violet wire (Violet/White wire on Grand Cherokee and Grand Wagoneer or Light Green/Orange wire on Wrangler) between ABS warning light and diode. Perform VERIFICATION TEST VER-1A.
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