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Test 3A - No Response From Body Control Module

  1. If ignition was off during BUS test, turn ignition on. If ignition was on during BUS test, turn ignition on, engine off. Disconnect scan tool. Using an external voltmeter, measure voltage between ground and DLC terminal No. 3 (Violet/Brown wire). If voltage is not 1.8-2.6 volts, go to step 3).
  2. If voltage is 1.8-2.6 volts, measure voltage between ground and DLC terminal No. 11 (White/Black wire). If voltage is not 1.8-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or scan tool.
  3. Disconnect Body Control Module (BCM) connectors. BCM is under left corner of instrument panel. Using external ohmmeter, measure resistance between BCM component connector, terminals No. 19 and 20. If resistance is not 100-140 ohms, replace BCM. If resistance is 100-140 ohms on both circuits, go to next step.
  4. Turn ignition on. Connect jumper wire between ground and BCM Black connector, terminal No. 19 (Violet/Brown wire). Using scan tool, select BODY, BODY COMPUTER, then SYSTEM TEST. Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
  5. Move jumper wire to BCM Black connector, terminal No. 20 (White/Black wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open White/Black wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
  6. Using external voltmeter, measure voltage between ground and BCM White connector, terminal No. 8 (Violet wire). If voltage is 10 volts or less, repair open Violet wire. If voltage is more than 10 volts, go to next step.
  7. Measure voltage between ground and BCM White connector, terminal No. 15 (Brown/Pink wire). If voltage is 10 volts or less, repair open Brown/Pink wire. If voltage is more than 10 volts, go to next step.
  8. Using external ohmmeter, measure resistance between ground and BCM White connector, terminal No. 24 (Black wire). If resistance is 5 ohms or greater, repair open Black wire. If resistance is less than 5 ohms, replace BCM.
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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