Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 351 (FIXED AND MOVEABLE WINDOWS SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCOMPONENT TESTING
2008 Chevrolet HHR LT, 2.4 P, Automatic
Component Testing
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Component Testing
WARNING: This page is about a different car, the 2010 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
Defog Switch
- Ignition OFF, disconnect the X2 harness connector at the HVAC control assembly.
- Test for infinite resistance between the signal terminal 3 and the ground terminal 9 with the switch in the open position.
- If not the specified value, replace the HVAC control assembly.
- Test for less the 2 ohms between the signal terminal 3 and the ground terminal 9 with the switch in the closed position.
- If greater than the specified range, replace the HVAC control assembly.
Defog Indicator
- Ignition OFF, disconnect the X2 harness connector at the HVAC control assembly.
- Install a 5A fused jumper wire between control terminal 13 and 12 volts. Install a jumper wire between the ground terminal 9 and ground. Verify the defog Indicator illuminates.
- If the defog indicator does not illuminate, replace the HVAC control assembly.
Rear Window Defogger Grid Test
- Ignition ON, turn on the rear window defogger.
- Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when testing each grid line in the middle.
- If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid.
- If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage supply side of the grid
Relay Test
- Ignition OFF, disconnect the REAR DEFOG relay.
- Test for 60-180 ohms between terminals 85 and 86.
- If not within the specified range, replace the relay.
- Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If not the specified value, replace the relay.
- Install a 25-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
- If greater than the specified range, replace the relay.
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.
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.