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Test No. 1: Power Seat Inoperative

  1. If memory seats system check was performed, go to next step. If memory seats system check was not performed, go to MEMORY SEATS SYSTEM CHECK  under TROUBLE SHOOTING.
  2. Turn ignition off. Disconnect Memory Seat Module (MSM) connector C2. See Figure . Turn ignition on. Using DVOM, measure voltage between MSM connector C2 terminals "C" (Black wire) and "D" (Orange wire). See Figure . If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step  6 .
  3. Disconnect left seat switch connector. Using DVOM, measure voltage between MSM connector C2 terminal "D" (Orange wire) and left seat switch connector terminal "H" (Black wire). See Fig 1 . If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step  7 .
  4. Check for short to voltage in all circuits between MSM and left power seat switch. See LEFT SEAT SWITCH CIRCUIT DESCRIPTION  table. If circuits are okay, go to next step. If faulty circuit is found, go to step  8 .
  5. Replace left seat switch. See POWER SEATS - ELDORADO article. After repairs, go to step  9 .
  6. Repair open in Black wire between MSM and splice S351 located in left seat harness approximately 2" (5.08 cm) from power seat motor harness breakout. After repairs, go to step  9 .
  7. Repair open in Black wire between left power seat switch and splice S351 located in left seat harness approximately 2" (5.08 cm) from power seat motor harness breakout. After repairs, go to step  9 .
  8. Repair short to voltage in faulty circuit. After repairs, go to next step.
  9. Recheck operation of power seats. Perform MEMORY SEATS SYSTEM CHECK  under TROUBLE SHOOTING. If non-memory power seat component or system is thought to be at fault, go to POWER SEATS - ELDORADO article.
LEFT SEAT SWITCH CIRCUIT DESCRIPTION

Seat Direction Seat Switch Connector Terminal (1) Memory Seat Module Connector C1 Terminal No. (2) Wire Color
Rear Up F 6 Yellow
Rear Down E 20 Light Blue
Front Up B 4 Dark Green
Front Down A 18 Dark Blue
Seat Forward D 5 Tan
Seat Backward C 19 Light Green
Recline Forward M 7 Gray/Black
Recline Back K 21 Dark Green/White
(1) See Fig 1 .
(2) See Figure .
Fig 1: Identifying Seat Switch Connector Terminals
G98G12209Courtesy of GENERAL MOTORS CORP.
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