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Test 13E - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  section at the end of 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 scan tool. Using an external voltmeter, check voltage between 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 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 scan tool cable or cartridge as necessary. Perform TEST VER-1.
  3. Disconnect Body Control Module (BCM) connectors. Using an external ohmmeter, check resistance between BCM pins No. 7 and 20. 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 BCM Blue connector terminal No. 14 and DLC. If resistance is more than 5 ohms, repair open 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 BCM Blue connector terminal No. 20 and DLC. If resistance is more than 5 ohms, repair open White/Black wire. Perform TEST VER-1.
  6. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on BCM Blue connector terminal No. 8, fused battery voltage circuit (Pink wire). If voltage is less than 10 volts, repair Pink wire as necessary. Perform TEST VER-1.
  7. If voltage is more than 10 volts, check voltage on BCM Blue connector terminal No. 11, fused ignition switch output circuit (Dark Blue wire). If voltage is less than 10 volts, repair Dark Blue wire as necessary. Perform TEST VER-1.
  8. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of BCM Blue connector terminal No. 19, 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 between BCM case and 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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