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HOMESERVICE MANUALSBUICK2000PARK AVENUE BASE, 3.8 KREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEMIRRORSPOWER MIRROR SYSTEMDIAGNOSTIC TESTSDTC U1161: LOSS OF PDM SERIAL DATA, DTC U1162: LOSS OF RDM SERIAL DATA OR DTC U1170: LOSS OF DRIVER DOOR SWITCH ASSEMBLY SERIAL DATADIAGNOSTIC PROCEDURE
2000 Buick Park Avenue Base, 3.8 K

Diagnostic Procedure

2000 Buick Park Avenue Base, 3.8 KSECTION Diagnostic Procedure
  1. Perform DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. Go to next step.
  2. Install scan tool. Turn ignition switch to ON position. If DTCs U1161, U1162 and U1170 have a current status, go to step  6 . If DTCs U1161, U1162 and U1170 do not have current status, go to next step.
  3. If DTCs U1161 and U1162 have current status, but DTC U1170 does not have current status, go to next step. If DTC U1170 has current status, go to step  5 .
  4. Test wiring and connections in simple serial bus circuit between Driver Door Module (DDM) and all other door modules. See WIRING DIAGRAMS in appropriate POWER WINDOWS article. If problem is found, repair and retest system. If problem is not found, replace DDM. See DOOR MODULE  under REMOVAL & INSTALLATION.
  5. Check power circuit, ground circuit at door module that is not functioning. See POWER DISTRIBUTION and GROUND DISTRIBUTION articles in WIRING DIAGRAMS. Check simple serial bus circuit at door module that is not functioning. See WIRING DIAGRAMS in appropriate POWER WINDOWS article. If problem is found, repair and retest system. If problem is not found, replace door module. See DOOR MODULE  under REMOVAL & INSTALLATION.
  6. Disconnect Driver Door Module (DDM) and Driver Door Switch Assembly (DDSA). Check simple bus serial circuit between DDM and DDSA. See WIRING DIAGRAMS in appropriate POWER WINDOWS article. If problem is found, repair and retest. If problem is not found, go to next step.
  7. Disconnect all other door modules. Turn ignition switch to ON position. Check for short to ground or short to power in simple serial bus circuit. See WIRING DIAGRAMS in appropriate POWER WINDOWS article. If problem is found, repair and retest. If problem is not found, go to next step.
  8. Turn ignition switch to OFF position. Reconnect DDM. Turn ignition switch to ON position. Operate driver door window and door lock with scan tool. If door window and door lock operate, go to next step. If door window and door lock do not operate, replace DDM. See DOOR MODULE  under REMOVAL & INSTALLATION.
  9. Turn ignition switch to OFF position. Connect DDSA. Turn ignition switch to ON position. Operate driver door window and door lock with DDSA. If door window and door lock operate, go to next step. If door window and door lock do not operate, replace DDSA. See POWER MIRROR SWITCH  under REMOVAL & INSTALLATION.
  10. Perform the following test for each door module. Turn ignition switch to OFF position. Connect door module. Turn ignition switch to ON position. Verify window operates from switch on door. Operate window from driver door switch. If window operates, go to next door. If window does not operate, connect scan tool and read DTCs from DDM. If "U" code for that door is present, replace door module. If "U" code for that door is not present, replace DDM. See DOOR MODULE  under REMOVAL & INSTALLATION.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.