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Home >> Jeep >> 1999 >> Grand Cherokee Laredo, 4.0 S, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Body Control Computer) >> Testing >> Vehicle Communications Tests >> Test 12B - Bus Short To Battery

Test 12B - Bus Short To Battery

WARNING: This page is about a different car, the 1996 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Using external ohmmeter, measure resistance between Powertrain Control Module (PCM) Gray connector, terminals C11 (Yellow/Red wire) and C30 (Violet/Brown wire). PCM is located at right corner of firewall. If resistance is less than 5 ohms, repair short between Yellow/Red wire and Violet/Brown wire. If resistance is 5 ohms or greater, go to next step.
  2. Measure resistance between PCM Gray connector, terminals C11 (Yellow/Red wire) and C28 (White/Black wire). If resistance is less than 5 ohms, repair short between Yellow/Red wire and White/Black wire. If resistance is 5 ohms or greater, replace PCM.
NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  and WIRING DIAGRAM  . After each repair, perform VERIFICATION TEST VER-1.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
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