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.
Satellite Broadcasting (SXM/HD Radio)
- Feature/Misdiagnose cases
Inspection Description (1) Feature - SXM/HD Radio continues to play last played channel before turning audio OFF
(2) Vehicle Parts configuration
(Radio antenna type and configuration)Β (3) Misdiagnose cases - Reception area β Due to poor reception, possibility of no sound issue
- Possibility of reception issue due to vehicle modification by user (ex: black box (noise from power), Rear view camera, Antenna that covers roof rack, aftermarket products, etc.)
β Remove any modification from vehicle and re-test
- Reception _NO SIGNAL or WEAK
Inspection Description (1) Duplicate issue - 'No Signal' message
- No sound issue
- 'WEAK' message
- Possible no sound issue
(2) External/Environmental Issue - Reception area
- Move location and re-test if issue occurred in a tunnel or covered parking area
- reception issue might occur due to signal interference (Mountains, buildings, iron bridges)
- If you are driving in a tunnel or a covered parking area.
- If you are driving beneath the top level of a multi-level freeway.
- If you are driving under a bridge.
- If you are driving next to a tall vehicle (such as a truck or a bus) that blocks the signal.
- If you are driving in a valley where the surrounding hills or peaks block the signal from the satellite.
- If you are driving on a mountain road where is the signal blocked by mountains.
- If you are driving in an area with tall trees that block the signal (30 ft./10m or more), for example on an road that goes through a dense forest.
- The signal can become weak in some areas that are not covered by the XMβ’ repeater network.
- reception issue might occur due to signal interference (Mountains, buildings, iron bridges)
(3) Cable connection status - Check status of cable connection
- Check antenna on rear side of AVN (*Type and location may vary)
- Check status of antenna cable connection
β Check 'A Pillar', 'C Pillar' using block diagram
- Check roof antenna connection
- Check cable status (modification)
(4) Defect caused by Ext. parts - Swap test antenna if connection is good
- Use certified test antenna or use good antenna from different vehicle
(5) Check H/U defect - If antenna is tested to be good and issue continues, replace H/U and re-test.
- 'No Signal' message
- Reception _Antenna Disconnected or Antenna Shorted
Inspection Description (1) Duplicate issue - 'Antenna Disconnected' message
- Mute issue
- 'Antenna Shorted' message
- Mute issue
(2) Cable connection - Check status of cable connection
- Check antenna on rear side of AVN (* Type and location may vary)
- Check status of antenna cable connection
β Check 'A Pillar', 'C Pillar' using block diagram
- Check roof antenna connection
- Check cable status (modification)
(3) Defect caused by Ext. parts - If connection is good, swap and test antenna and feeder cable
- Use certified test antenna or use good antenna from different vehicle
- If issue continues, replace feeder cable
(4) Check part defect - If antenna and feeder cable are tested to be good, replace good H/U and re-test.
- HD Radio features/Misdiagnose cases
Inspection Description (1) System features - HD Radio reception is good (HD Radio mode ON)
- Displays HD Radio logo and sub-channels selection enabled
- Digital radio output-Digital radio-Improved reception quality
- Additional service information (Station info)
- HD Radio reception is weak: Poor reception area
- HD Radio logo is blinking
- HD Radio goes ON/OFF
β Switches HD β Analog Radio
Noise can be heard during a poor reception environment
- No HD Radio reception
- No HD Radio logo
- Output Analog AM/FM Radio
(2) Misdiagnose cases - Check H/U Specs - some vehicle/platform does not have HD Radio option available
- HD Radio is unavailable where AM/FM Radio reception is unavailable
- Check poor reception area β HD Radio may be unavailable in certain area
- Check vehicle modification β Remove any custom modification and re-test
- Reception issue due to black box/inverter signal
- Strong tint on glass antenna (Sedan) may reduce reception performance
- Other modification that may have damaged antenna/feeder cable will reduce reception performance
- Misconnection of antenna/feeder cable may reduce reception performance
- If antenna/feeder cable is damaged, reception issue may occur
- HD Radio reception is good (HD Radio mode ON)
- HD Radio reception
Inspection Description (1) Duplicate issue - HD Radio reception issue duplicates all the time (different areas)?
- Inspect vehicle: check antenna and feeder cable status
- Replace good H/U and re-test
- HD Radio reception issue duplicates on certain location only?
- Inspect reception environment: Poor reception area
- Inspect vehicle: check antenna and feeder cable status with strong reception environment
- Replace H/U and re-test
(2) Detailed inspection - Poor reception area
- Accessary
- Cable connection
- Antenna/feeder cable
- H/U
- Move to location where HD Radio reception is good and test: environment/location issue
- If reception issue continues, proceed with step Β 2.
- Resolve environment related reception issue
- If reception issue continues after inspection below, proceed with step Β 3
- Black box: Remove black box power
- Remove any charger/cigar jack from power plug and check reception improvement
- Reception issue might occur for glass antenna vehicle(Sedan) with tinted windows
- If reception issue continues after inspection below, proceed with step Β 3
- Check FS(dB) in Engineering Mode
- If reception issue continues after inspection below, proceed with step 4
(1) Enter Engineering mode β Module Info β AM or FM β AM or FM Engineering Mode
[Method]
- Setup β System Info
- Click "Storage" Tab at left
- Touch "A" position 5 times, "B" position 1 time
* For some platforms or SW versions, step 2) is done at 'SW Info' Tab, not at "Storage" Tab.
- If reception issue continues after inspection below, proceed with step 4
(3) Detailed inspection - Poor reception area
- Accessary
- Cable connection
- Antenna/feeder cable
- H/U
(1) FS(dB) Review: HD Radio reception may be unavailable if FS(dB) is too low - FM: FS 30 or below β Poor reception area
- M: FS 40 or below β Poor reception area
[Engineering mode > Module Info > AM or FM]- At left, touch AM or FM Tab β Click "Launch AM/FM Engineering Mode"
- Check reception sensitivity of AM/FM: FS(dB)
LTypically, if FS value is below 40 at AM/below 30 at FM, the area is "Weak-Signal" area.
4. Antenna/feeder cable connection- Antenna connection at rear H/U (*Antenna location may vary)
- Join antenna connection β Refer to vehicle diagram, 'A Pillar', 'C Pilla'
- Check power source and connection for roof antenna/Pillar area (Glass antenna)
- Cable modification
(4) Defect caused by Ext. parts - Replace antenna: Use certified test antenna or use good antenna from other vehicle
- If issue is still present, replace feeder cable
(5) Check H/U defect - If inspection above did not resolve the issue, replace H/U and re-test
- 'Antenna Disconnected' message
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.