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Test 13D - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR  IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS  . Perform TEST VER-1 after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
NOTE: Ignition off during bus test is most common cause for these trouble codes.
  1. Turn ignition on, engine off. Disconnect DRB. Using an external voltmeter, check voltage between chassis ground and Data Link Connector (DLC) connector terminal No. 4 (Violet/Brown wire). If voltage is not 2.3-2.6 volts, go to step 3).
  2. If voltage is 2.3-2.6 volts, check voltage between chassis ground and DLC connector terminal No. 3 (White/Black wire). If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace DRB cable or cartridge as necessary.
  3. Disconnect Body Control Module (BCM). BCM is located behind right kick panel. Using an external ohmmeter, check resistance between BCM terminals No. 14 and 15. See Figure . If resistance is not 100-140 ohms, replace BCM.
  4. If resistance is 100-140 ohms, check resistance of Violet/Brown wire between BCM Black connector terminal No. 14 and DLC connector terminal No. 4. If resistance is more than 5 ohms, repair open Violet/Brown wire.
  5. If resistance is less than 5 ohms, check resistance of White/Black wire between BCM Black connector terminal No. 15 and DLC connector terminal No. 3. If resistance is more than 5 ohms, repair open White/Black wire.
  6. If resistance is less than 5 ohms, reconnect DRB. Using DRB in voltmeter mode, check voltage on BCM Black connector terminal No. 16 (Pink wire). If voltage is less than 10 volts, repair Pink wire as necessary.
  7. If voltage is more than 10 volts, check voltage on BCM Black connector terminal No. 12 (Dark Blue/White wire). If voltage is less than 10 volts, repair Dark Blue/White wire as necessary.
  8. If voltage is more than 10 volts, using DRB in ohmmeter mode, check resistance of BCM Black connector terminal No. 13, ground circuit (Black/Light Green wire). If resistance is more than 5 ohms, repair open in Black/Light Green wire.
  9. If resistance is less than 5 ohms, check resistance of BCM case ground. If resistance is more than 5 ohms, repair BCM case ground as necessary. If resistance is less than 5 ohms, replace BCM.
NOTE: A break in test sequence occurs at this point. No test procedures have been omitted.
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