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Test 13D - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS - 3.0L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1.
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 this trouble code.
  1. If ignition was off during BUS test, turn ignition on, engine off. If ignition was on during BUS test, turn ignition off. Disconnect scan tool. Turn ignition on. 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 scan tool cable or cartridge as necessary.
  3. Turn ignition off. Disconnect Body Control Module (BCM). BCM is located behind right kick panel. Using an external ohmmeter, check resistance between BCM terminals No. 7 and 20. 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. 7 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. 20 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 scan tool. Using scan tool in voltmeter mode, check voltage on BCM Black connector terminal No. 8 (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. 6 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire.
  8. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of BCM Black connector terminal No. 19, 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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