Code
U1900
HYUNDAI
U — Network/User
GPS Antenna Line Break
Views:
UK: 12
EN: 14
RU: 14
AI status
Completed
Completed
100%
Causes
- Open or broken antenna coax wire or center conductor
- Corroded, bent, or damaged GPS antenna connector (roof, windshield, or trunk area)
- Failed/defective active GPS antenna (internal amplifier failure)
- Disconnected, loose, or damaged connector at the head unit/navigation ECU or antenna module
- Water intrusion or physical impact damage to antenna or wiring
- Aftermarket installations or repairs that damaged the antenna lead or used wrong connectors
Symptoms
- No GPS satellite lock or slow/no acquisition of satellites
- Navigation system shows "No GPS signal", "Searching for GPS", or similar warnings
- Incorrect vehicle location or position drift on map
- Navigation guidance unavailable or behaves erratically
- Telematics features relying on GPS (e.g., emergency location, connected services) may be disabled
What to check
- Read stored DTCs and freeze frame data with a proper scan tool; confirm U1900 and note any related codes
- Visually inspect the GPS antenna (roof, shark-fin, windshield area) and its connector for damage, corrosion, or water intrusion
- Inspect antenna cable routing for pinch points, chafing, or breaks where it passes through body panels or grommets
- Backprobe the antenna connector and head unit/navigation ECU connector to confirm mating and wiring condition
- Check for recent aftermarket radio/telematics installations or repairs that might have disturbed the antenna lead
Signal parameters
- Antenna feed is an RF coaxial lead carrying GPS L1 RF (~1575.42 MHz) and typically biased by a DC feed for an active antenna (bias voltage commonly 3–5 V)
- Typical antenna feed impedance around 50 ohms (coax)
- Open-circuit condition: infinite resistance on center conductor when measured with multimeter (with connectors disconnected)
- Short condition: low resistance between center conductor and shield (< a few ohms indicates short)
Diagnostic algorithm
- Confirm and record the U1900 code and any associated codes using a scan tool; do not clear codes yet
- Perform a visual inspection of the external antenna assembly and route of the coax cable for obvious damage or water intrusion
- Disconnect battery only if manufacturer procedures require it before removing trim; otherwise perform non-powered checks as appropriate
- Access antenna connector(s) at the antenna and at the head unit/navigation ECU; disconnect and inspect pins for corrosion, bent pins, or damage
- Check continuity of the antenna center conductor from the antenna connector to the navigation ECU connector using a multimeter; expect continuity (low ohms) — open = line break
- Check for short between center conductor and shield (coax); there should be no short (infinite/very high resistance)
- With ignition ON and antenna connected, measure DC bias voltage on the antenna feed (backprobe center pin) — active antennas commonly require about 3–5 V; reference manufacturer spec before testing
- If wiring and voltage are correct but no RF signal, substitute a known-good antenna or navigation unit if available to isolate the failed component
- Repair or replace damaged coax, connectors, or antenna; use proper coax and connectors, avoid sharp bends; reseal any roof or body penetrations to prevent water ingress
- After repairs, clear codes, perform a satellite acquisition test and road test to verify proper GPS lock and that the code does not return
Likely causes
- Broken/coaxial center conductor between antenna and navigation unit (most common)
- Loose or corroded antenna connector at the headliner or module
- Failed powered (active) GPS antenna
- Damaged wiring harness where it passes through doors, pillars or body seams
Fault status
Status
GPS Antenna Line Break — navigation/GPS signal unavailable. Inspect antenna, coax and connectors for an open circuit or damage.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
U1900
LAND ROVER
U — Network/User
CAN bus 2 failure in communication bus - reception error
Views:
UK: 6
EN: 8
RU: 7
AI status
Completed
Completed
100%
Causes
- Open or broken antenna coax wire or center conductor
- Corroded, bent, or damaged GPS antenna connector (roof, windshield, or trunk area)
- Failed/defective active GPS antenna (internal amplifier failure)
- Disconnected, loose, or damaged connector at the head unit/navigation ECU or antenna module
- Water intrusion or physical impact damage to antenna or wiring
- Aftermarket installations or repairs that damaged the antenna lead or used wrong connectors
Symptoms
- No GPS satellite lock or slow/no acquisition of satellites
- Navigation system shows "No GPS signal", "Searching for GPS", or similar warnings
- Incorrect vehicle location or position drift on map
- Navigation guidance unavailable or behaves erratically
- Telematics features relying on GPS (e.g., emergency location, connected services) may be disabled
What to check
- Read stored DTCs and freeze frame data with a proper scan tool; confirm U1900 and note any related codes
- Visually inspect the GPS antenna (roof, shark-fin, windshield area) and its connector for damage, corrosion, or water intrusion
- Inspect antenna cable routing for pinch points, chafing, or breaks where it passes through body panels or grommets
- Backprobe the antenna connector and head unit/navigation ECU connector to confirm mating and wiring condition
- Check for recent aftermarket radio/telematics installations or repairs that might have disturbed the antenna lead
Signal parameters
- Antenna feed is an RF coaxial lead carrying GPS L1 RF (~1575.42 MHz) and typically biased by a DC feed for an active antenna (bias voltage commonly 3–5 V)
- Typical antenna feed impedance around 50 ohms (coax)
- Open-circuit condition: infinite resistance on center conductor when measured with multimeter (with connectors disconnected)
- Short condition: low resistance between center conductor and shield (< a few ohms indicates short)
Diagnostic algorithm
- Confirm and record the U1900 code and any associated codes using a scan tool; do not clear codes yet
- Perform a visual inspection of the external antenna assembly and route of the coax cable for obvious damage or water intrusion
- Disconnect battery only if manufacturer procedures require it before removing trim; otherwise perform non-powered checks as appropriate
- Access antenna connector(s) at the antenna and at the head unit/navigation ECU; disconnect and inspect pins for corrosion, bent pins, or damage
- Check continuity of the antenna center conductor from the antenna connector to the navigation ECU connector using a multimeter; expect continuity (low ohms) — open = line break
- Check for short between center conductor and shield (coax); there should be no short (infinite/very high resistance)
- With ignition ON and antenna connected, measure DC bias voltage on the antenna feed (backprobe center pin) — active antennas commonly require about 3–5 V; reference manufacturer spec before testing
- If wiring and voltage are correct but no RF signal, substitute a known-good antenna or navigation unit if available to isolate the failed component
- Repair or replace damaged coax, connectors, or antenna; use proper coax and connectors, avoid sharp bends; reseal any roof or body penetrations to prevent water ingress
- After repairs, clear codes, perform a satellite acquisition test and road test to verify proper GPS lock and that the code does not return
Likely causes
- Broken/coaxial center conductor between antenna and navigation unit (most common)
- Loose or corroded antenna connector at the headliner or module
- Failed powered (active) GPS antenna
- Damaged wiring harness where it passes through doors, pillars or body seams
Fault status
Status
GPS Antenna Line Break — navigation/GPS signal unavailable. Inspect antenna, coax and connectors for an open circuit or damage.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
U1900
Other
U — Network/User
CAN Communication Bus Fault
Views:
UK: 17
EN: 23
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or broken antenna coax wire or center conductor
- Corroded, bent, or damaged GPS antenna connector (roof, windshield, or trunk area)
- Failed/defective active GPS antenna (internal amplifier failure)
- Disconnected, loose, or damaged connector at the head unit/navigation ECU or antenna module
- Water intrusion or physical impact damage to antenna or wiring
- Aftermarket installations or repairs that damaged the antenna lead or used wrong connectors
Symptoms
- No GPS satellite lock or slow/no acquisition of satellites
- Navigation system shows "No GPS signal", "Searching for GPS", or similar warnings
- Incorrect vehicle location or position drift on map
- Navigation guidance unavailable or behaves erratically
- Telematics features relying on GPS (e.g., emergency location, connected services) may be disabled
What to check
- Read stored DTCs and freeze frame data with a proper scan tool; confirm U1900 and note any related codes
- Visually inspect the GPS antenna (roof, shark-fin, windshield area) and its connector for damage, corrosion, or water intrusion
- Inspect antenna cable routing for pinch points, chafing, or breaks where it passes through body panels or grommets
- Backprobe the antenna connector and head unit/navigation ECU connector to confirm mating and wiring condition
- Check for recent aftermarket radio/telematics installations or repairs that might have disturbed the antenna lead
Signal parameters
- Antenna feed is an RF coaxial lead carrying GPS L1 RF (~1575.42 MHz) and typically biased by a DC feed for an active antenna (bias voltage commonly 3–5 V)
- Typical antenna feed impedance around 50 ohms (coax)
- Open-circuit condition: infinite resistance on center conductor when measured with multimeter (with connectors disconnected)
- Short condition: low resistance between center conductor and shield (< a few ohms indicates short)
Diagnostic algorithm
- Confirm and record the U1900 code and any associated codes using a scan tool; do not clear codes yet
- Perform a visual inspection of the external antenna assembly and route of the coax cable for obvious damage or water intrusion
- Disconnect battery only if manufacturer procedures require it before removing trim; otherwise perform non-powered checks as appropriate
- Access antenna connector(s) at the antenna and at the head unit/navigation ECU; disconnect and inspect pins for corrosion, bent pins, or damage
- Check continuity of the antenna center conductor from the antenna connector to the navigation ECU connector using a multimeter; expect continuity (low ohms) — open = line break
- Check for short between center conductor and shield (coax); there should be no short (infinite/very high resistance)
- With ignition ON and antenna connected, measure DC bias voltage on the antenna feed (backprobe center pin) — active antennas commonly require about 3–5 V; reference manufacturer spec before testing
- If wiring and voltage are correct but no RF signal, substitute a known-good antenna or navigation unit if available to isolate the failed component
- Repair or replace damaged coax, connectors, or antenna; use proper coax and connectors, avoid sharp bends; reseal any roof or body penetrations to prevent water ingress
- After repairs, clear codes, perform a satellite acquisition test and road test to verify proper GPS lock and that the code does not return
Likely causes
- Broken/coaxial center conductor between antenna and navigation unit (most common)
- Loose or corroded antenna connector at the headliner or module
- Failed powered (active) GPS antenna
- Damaged wiring harness where it passes through doors, pillars or body seams
Fault status
Status
GPS Antenna Line Break — navigation/GPS signal unavailable. Inspect antenna, coax and connectors for an open circuit or damage.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email