CSWM Dodge/Chrysler/Jeep/Maserati

Important: Use this guide if you reinstalled your repaired (CSWM Central Seat Warmth Module) and the problem is still happening.
Important: Please do not open/disassemble the module.

• Step 1: Confirm the exact symptom
  • Heated seat buttons not responding
  • One seat works, the other doesn’t
  • Seats turn on briefly, then shut off
  • Indicator stays on but there is no heat
• Step 2: Do a clean reset first (common after reinstall)
  • Key off, remove key, wait 2 minutes
  • Disconnect battery for 5 minutes (if accessible), reconnect
  • Start the vehicle and re-test (low voltage during crank can disable seat heat)
• Step 3: Verify the right module and connectors are fully seated
  • Confirm the CSWM connector(s) are fully locked in place
  • Inspect for bent pins, pushed-out terminals, corrosion, or loose pin fitment
  • Wiggle-test the harness lightly while commanding heated seats ON and watch for dropouts
• Step 4: Check power/ground and seat-heater related fuses
  • Check fuses for:
    • Heated seats / seat module / CSWM
    • Interior electronics / ignition feed
    • Seat power circuits (if applicable)
  • If a fuse is blown, replace once and re-test
  • If it blows again, stop and inspect for a short in the seat heater circuits or wiring
• Step 5: If the seat turns on briefly then shuts off (most common vehicle-side cause)
  • This usually indicates the module is detecting an abnormal load and shutting down for protection
  • Common causes:
    • Open circuit in the seat heater element (cushion or backrest)
    • Shorted heater element or wiring
    • Faulty seat temperature sensor / thermistor (reading too hot/too cold)
    • Damaged wiring under the seat or at the seat connector (pinched in tracks)
• Step 6: If the indicator stays on but there’s no heat
  • Check for:
    • Failed heater element (open circuit)
    • Loose seat connector under the seat
    • Poor ground at the seat/frame ground point
  • Verify both cushion and backrest heaters are connected (some systems require both to operate normally)
• Step 7: If only one seat works
  • Swap-focus troubleshooting to the non-working side:
    • Under-seat connector condition and pin fitment
    • Seat element / sensor integrity
    • Seat ground point
  • If the problem follows the seat (not the module), it’s seat-side wiring/element/sensor
• Step 8: Scan for related codes (if available)
  • Scan body/seat modules and record any heated-seat or seat communication codes
  • Clear codes, retest heated seats for 1–2 minutes, then re-scan
  • If there are communication-related faults, prioritize power/ground, connector pins, and network wiring checks
• Step 9: If the issue began after interior work
  • If seats were removed, swapped, or wiring was repaired recently, re-check what was touched first
  • Pinched wires and partially-seated connectors under the seat are very common
• Step 10: Still not resolved?
  • If steps above don’t restore operation, the next most likely cause is a failed seat heater element/sensor or wiring issue under the seat that requires hands-on diagnosis by a qualified local shop.