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DTC U1170: Loss Of Left Front Power Window Switch Assembly Simple Bus Serial Data: Testing

  1. Perform door control system check. See DOOR CONTROL SYSTEM CHECK  under TROUBLE SHOOTING. After performing system check, go to next step.
  2. If DTC U1161 is also set, go to DTC U1161. If DTC U1161 is not set, go to next step.
  3. Disconnect Left Front Power Window Switch (LFPWS) assembly connector. Using DVOM, measure voltage between LFPWS assembly connector terminal No. 9 (Orange wire) and ground. If 10-15 volts exists, go to step 5). If 10-15 volts does not exists, go to next step.
  4. Repair open or short to ground in circuit No. 640 (Orange wire) between LFDM and LFPWS assembly. Recheck system operation.
  5. Using DVOM, measure resistance between LFPWS assembly connector terminal No. 8 (Black/White wire) and ground. If resistance is infinite, go to next step. If resistance is not infinite, go to step 7).
  6. Repair open in circuit No. 351 (Black/White wire) between LFDM and LFPWS assembly. Recheck system operation.
  7. Using DVOM, measure resistance of Tan/White wire between LFDM connector C1 terminal No. 15 and LFPWS assembly connector terminal No. 10. If resistance is 0-2 ohms, go to step 9). If resistance is not 0-2 ohms, go to next step.
  8. Repair open or high resistance in circuit No. 2076 (Tan/White wire) between LFDM and LFPWS assembly. Recheck system operation.
  9. Replace LFPWS assembly. Recheck system operation.
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