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Test 13E - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  in this article. For wiring diagram, see WIRING DIAGRAMS  in this article.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ignition off during BUS test is most common cause for this message. If ignition was off, turn ignition on (engine off). If ignition was on, disconnect DRB. Using an external voltmeter, check voltage between CCD Data Link Connector (DLC), CCD BUS positive circuit (Violet/Brown wire) and ground. 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 CCD DLC, CCD BUS negative circuit (White/Black wire) and ground. 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. Perform TEST VER-1.
  3. Disconnect Body Control Module (BCM) connectors. BCM is located behind knee panel below dashboard. Using an external ohmmeter, check resistance between BCM pins No. 14 and 15. See Figure . If resistance is not 100-140 ohms, replace BCM. Perform TEST VER-1.
  4. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between Blue BCM connector terminal No. 14 and CCD DLC. If resistance is more than 5 ohms, repair open circuit in Violet/Brown wire. Perform TEST VER-1.
  5. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire) between Blue BCM connector terminal No. 15 and CCD DLC. If resistance is more than 5 ohms, repair open circuit in White/Black wire. Perform TEST VER-1.
  6. If resistance is less than 5 ohms, reconnect DRB. Using DRB in voltmeter mode, check voltage on Blue BCM connector terminal No. 16, fused battery feed circuit (Pink wire). If voltage is not more than 10 volts, repair Pink wire as necessary. Perform TEST VER-1.
  7. If voltage is more than 10 volts, check voltage on Blue BCM connector terminal No. 12, fused ignition feed run/start circuit (Dark Blue/White wire). If voltage is less than 10 volts, repair Dark Blue/White wire as necessary. Perform TEST VER-1.
  8. If voltage is more than 10 volts, turn ignition off. Using DRB in ohmmeter mode, check resistance of Blue BCM connector terminal No. 13, ground circuit (Black/Light Green wire). If resistance is more than 15 ohms, repair open to ground in Black/Light Green wire. Perform TEST VER-1.
  9. If resistance is less than 15 ohms, check resistance of BCM case ground. If resistance is more than 5 ohms, repair BCM case ground as necessary. Perform TEST VER-1. If resistance is less than 5 ohms, replace BCM. Perform TEST VER-1.
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