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Home >> Jeep >> 1993 >> Cherokee Country, 4D Utility, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Test 13A >> Main Relay/Power Circuit Failure

Main Relay/Power Circuit Failure

  1. Check ABS system fuse in Power Distribution Center (PDC). If fuse is not okay, perform TEST 13B. If fuse is okay, go to next step.
  2. Check if charging system is overcharging. If charging system is operating properly, go to next step. If charging system is not operating properly, repair as necessary. Perform VERIFICATION TEST VER-1A.
  3. Temporarily replace ABS main relay with another 5-terminal relay from PDC. Using DRB-II, erase ABS fault messages. Cycle ignition off and on. Using DRB-II, read ABS fault messages. If MAIN RELAY/POWER CIRCUIT FAILURE message is displayed, go to next step. If fault is not displayed, replace ABS main relay. Perform VERIFICATION TEST VER-1A.
  4. Install replacement 5-terminal relay back into PDC, leaving ABS main relay disconnected (removed). With DRB-II in voltmeter mode, probe fused battery feed Red/Dark Green wire (Red/Light Green wire on Grand Cherokee and Grand Wagoneer) at ABS main relay socket. If voltage is more than 9 volts, go to next step. If voltage is less than 9 volts, repair open Red/Dark Green wire (Red/Light Green on Grand Cherokee and Grand Wagoneer) wire to ABS fuse in PDC. Perform VERIFICATION TEST VER-1A.
  5. Turn ignition off. Disconnect and inspect CAB 55-pin connector. Repair connector as necessary. Ensure ABS main relay is still disconnected. Using an external ohmmeter, check continuity of Pink (Pink/Dark Blue on Grand Cherokee and Grand Wagoneer) wire between CAB connector terminal No. 34 and ABS main relay socket terminal "C". If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Pink (Pink/Dark Blue on Grand Cherokee and Grand Wagoneer) wire to ABS main relay. Perform VERIFICATION TEST VER-1A.
  6. Check continuity of Gray/Yellow wire between CAB connector terminal No. 3 and ABS main relay socket terminal "B". If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Gray/Yellow wire to ABS main relay. Perform VERIFICATION TEST VER-1A.
  7. Check continuity of Gray/Yellow wire between CAB connector terminal No. 33 and ABS main relay socket terminal "B". If resistance is less than 5 ohms, replace CAB. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, repair open Gray/Yellow wire to ABS main relay. Perform VERIFICATION TEST VER-1A.
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