FixVault

MSM Module Does Not Make Relay Click Sound When Any Power Seat Switch Input Is Selected

  1. Check power and ground circuits. See CHECKING POWER & GROUNDS  under TESTING. Ensure connectors are firmly engaged into MSM module.
  2. To wake up MSM module, shift vehicle into any gear. Position sense voltage can be checked at MSM module 21-pin and 25-pin connectors. See MSM MODULE 21-PIN CONNECTOR TERMINAL IDENTIFICATION  table and MSM MODULE 25-PIN CONNECTOR TERMINAL IDENTIFICATION  table. Ensure driver power seat switch connector is seated firmly on inside and outside of shield.
  3. Using DVOM, check driver power seat switch for output voltage at appropriate terminals. See WIRING DIAGRAMS  . Check for driver power seat switch output voltage at appropriate MSM module terminals. See MSM MODULE 21-PIN CONNECTOR TERMINAL IDENTIFICATION  table and test terminals No. 1-4 and 12-15. See Figure . If voltage is not present at any terminal of MSM module, repair or replace seat wiring harness. If voltage is present at all terminals of MSM module, replace MSM module.