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Test 13L - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ignition off during bus test is the most common cause for these messages. Turn ignition on, engine off. Disconnect DRB-II. Using an external voltmeter, check voltage between CCD data link connector CCD bus positive circuit (Violet/Brown wire) and ground. If voltage is not 2.3-2.6 volts, go to step 4).
  2. If voltage is 2.3-2.6 volts, check voltage between CCD data link connector CCD bus negative circuit (White/Black wire) and ground.
  3. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace DRB-II cable or cartridge as necessary. Perform VERIFICATION PROCEDURE VER-1.
  4. Disconnect Body Control Module (BCM). BCM is located behind right kick panel. Using an external ohmmeter, check resistance between BCM Bone connector pins No. 7 and 8. If resistance is not 100-140 ohms, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
  5. If resistance is 100-140 ohms, check resistance between BCM Bone connector terminal No. 8 and CCD data link connector CCD bus positive circuit (Violet/Brown wire). If resistance is more than 5 ohms, repair open circuit in Violet/Brown wire. Perform VERIFICATION PROCEDURE VER-1.
  6. If resistance is less than 5 ohms, check resistance between BCM Bone connector terminal No. 7 and CCD data link connector CCD bus negative circuit (White/Black wire). If resistance is more than 5 ohms, repair open circuit in White/Black wire. Perform VERIFICATION PROCEDURE VER-1.
  7. If resistance is less than 5 ohms, reconnect DRB-II and place in voltmeter mode. Check voltage on BCM Bone connector terminal No. 19, fused battery feed circuit (Pink wire). If voltage is not more than 10 volts, repair Pink wire as necessary. Perform VERIFICATION PROCEDURE VER-1.
  8. If voltage is more than 10 volts, check voltage on BCM Bone connector terminal No. 13, fused ignition feed run/start circuit (Dark Blue/White wire). If voltage is not more than 10 volts, repair open circuit in Dark Blue/White wire. Perform VERIFICATION PROCEDURE VER-1.
  9. If voltage is more than 10 volts, change DRB-II to ohmmeter mode. Check resistance at BCM Bone connector terminal No. 21, system ground circuit (Black wire).
  10. If resistance is more than 5 ohms, repair open to ground in Black wire. Perform VERIFICATION PROCEDURE VER-1. If resistance is less than 5 ohms, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
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