SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA2008TRIBUTE I SPORT, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTSEATSSYMPTOM TROUBLESHOOTING [WINDOWS/MIRRORS/ROOF/SEATS - EXCEPT HYBRID)PINPOINT TEST 7: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLYNORMAL OPERATION
2008 Mazda Tribute i Sport, FWD, Standard

Normal Operation

2008 Mazda Tribute i Sport, FWD, StandardSECTION Normal Operation

The rear window defrost relay receives power from the battery junction box (BJB) fuse 35 (10A) on circuit (Y/GY). When the rear window defrost switch is pressed to the ON position, the manual climate control module activates the rear window defrost relay by grounding circuit (W/O). When activated, the rear window defrost relay supplies 12 volts, to the rear window defrost grid on circuit (BR/Y). The rear window defrost grid is grounded through circuit (B/GY) to ground.

The manual climate control module will deactivate the rear window defrost relay when one of the following conditions is met:

  • The rear window defrost switch is pressed when feature is active.
  • The ignition switch state is changed from ON to OFF/LOCK.
  • The 15-minute timing function is complete.
  • DTC B12BF - Heated backlight/mirror relay drive circuit open or shorted to ground, heated backlight and heated mirrors wire failure, relay drive circuit open or shorted to ground.

    Possible Causes 

  • Rear window defrost relay
  • Wiring, terminals or connectors
  • Rear window defrost switch (integral to manual climate control module)
  • Manual climate control module
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.