LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 1999 >> LHS >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Vehicle Communications System >> Symptom Id Tests >> Test 4A: No Response From Body Control Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test 4A: No Response From Body Control Module

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Turn ignition on. Using scan tool, read BCM DTCs. If scan tool does not display BATTERY POWER TO MODULE DISCONNECTED, go to step  3 . If scan tool displays BATTERY POWER TO MODULE DISCONNECTED, go to next step.
  2. Turn ignition off. Disconnect Body Control Module (BCM). BCM is connected to junction block. Turn ignition on. Using external voltmeter, measure voltage between ground and junction block internal 20-pin connector terminal No. 7. See Fig 1 . If voltage is 10 volts or less, replace junction block. If voltage is more than 10 volts, replace BCM.
    Fig 1: Locating BCM/Junction Block Connector Terminals (Rear View)
    G98B00086Courtesy of CHRYSLER CORP.
  3. Disconnect scan tool from DLC. Using external voltmeter, measure voltage between ground and DLC terminal No. 2 (Violet/Yellow wire). If voltage is .5-8 volts, go to TEST 12A  . If voltage is more than 8 volts, go to TEST 13A  . If voltage is less than .5 volt, go to next step.
  4. Turn ignition off. Disconnect Body Control Module (BCM). BCM is connected to junction block. Ensure all junction block connectors are connected. Turn ignition on. Measure voltage between ground and junction block internal 20-pin connector terminal No. 7. See Fig 1 . If voltage is 10 volts or less, replace junction block. If voltage is more than 10 volts, go to next step.
  5. Turn ignition off. Using external ohmmeter, measure resistance between ground and junction block internal 20-pin connector terminal No. 1. If resistance is 5 ohms or more, repair open ground circuit. See appropriate wiring diagram in BODY CONTROL COMPUTER - INTRODUCTION article. If resistance is less than 5 ohms, go to next step.
  6. Measure resistance between ground and junction block internal 20-pin connector terminal No. 20. If resistance is 100 ohms or more, repair open ground circuit. See appropriate wiring diagram in BODY CONTROL COMPUTER - INTRODUCTION article. If resistance is less than 100 ohms, replace BCM.
scientia non olet · About LEMON Manuals