Code
B1260
ALFA ROMEO
B — Body
Solar radiation sensor short to ground
Views:
UK: 2
EN: 4
RU: 2
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with conductor contacting chassis ground
- Corroded/loose connector at the solar sensor
- Internal short inside the solar radiation sensor
- Water ingress or contamination at connector or sensor
- Poor pin contact or bent terminal in connector
- Faulty HVAC/body control module or wiring connector at the module (less common)
Symptoms
- Auto climate control not responding correctly to sunlight (overcooling/overheating)
- Incorrect or stuck HVAC blower operation related to sun load
- Warning or message related to climate control or sensor on instrument cluster (depending on model)
- Stored B1260 DTC and possibly related HVAC faults
- Live-data sun sensor value remains at or near zero
What to check
- Read and record freeze-frame/live-data with a scan tool; confirm B1260 is current and note related codes
- Visually inspect solar sensor (usually on top of dashboard under windshield) and wiring harness for damage, pinched wires or water ingress
- Inspect connector for corrosion, bent pins, and proper locking
- Back-probe signal, 5V reference and ground with ignition ON (engine off) using a multimeter
- Check resistance between the sensor signal wire and chassis ground with ignition OFF (should be high/OL if not shorted)
- Wiggle harness and connectors while watching live data to reproduce the fault
Signal parameters
- Reference supply: typically +5 V reference (verify factory wiring diagram)
- Signal output: ~0 to 5 V proportional to solar irradiance (at strong sun near upper range)
- Short to ground condition: signal near 0 V with key on (0.0–0.5 V)
- Expected resistance from signal wire to chassis ground (ign off): very high / open (>> megaohms) if no short
Diagnostic algorithm
- Retrieve codes and live data with a manufacturer-level scan tool. Confirm B1260 and freeze-frame conditions. Clear codes and see if B1260 returns.
- Visually inspect the sensor and harness at the dash top for damage, water intrusion, pinched wires or connector corrosion. Repair any obvious damage.
- With ignition ON (engine off), back-probe the sensor connector: verify reference voltage (≈5 V) and sensor ground. If reference is missing or low, trace supply or fused feed. If reference present but signal ≈0 V, suspect short to ground or failed sensor.
- With ignition OFF, measure resistance between the signal wire (at the sensor connector) and chassis ground. A low resistance indicates a short to ground in the sensor or harness. If high resistance (open), the short may be intermittent—perform wiggle test with key on while watching live data.
- Disconnect the sensor connector. With key ON, check the signal wire voltage at the harness side: if the voltage rises toward the reference (or float) when sensor disconnected, the sensor is likely shorted internally. If signal remains ~0 V, short is in the wiring between harness and module—trace wiring and check grounds/connectors.
- If wiring appears intact, unplug the HVAC/body control module connector and measure continuity between the signal wire and module pin to isolate section with short. Repair any chafed wiring, replace corroded connector pins or repair pinouts per wiring diagram.
- Replace the solar radiation sensor if internal short is confirmed. After repair, clear codes and verify correct live-data values under sunlight and that code does not return.
- If fault persists after sensor and wiring repair, inspect/replace control module connector or consult module-level diagnostics; consider module substitution only after wiring and sensor verified.
- Use manufacturer wiring diagrams and connector views for pin identification and torque/specs when replacing parts.
Likely causes
- Shorted signal wire to chassis ground due to wiring chafe under dash
- Corroded connector causing low-resistance path to ground
- Failed internal sensor electronics creating direct path to ground
Fault status
Status
Solar radiation sensor circuit — short to ground. Fault stored by HVAC/body control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1260
FIAT
B — Body
Solar radiation sensor short to ground
Views:
UK: 1
EN: 2
RU: 2
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with conductor contacting chassis ground
- Corroded/loose connector at the solar sensor
- Internal short inside the solar radiation sensor
- Water ingress or contamination at connector or sensor
- Poor pin contact or bent terminal in connector
- Faulty HVAC/body control module or wiring connector at the module (less common)
Symptoms
- Auto climate control not responding correctly to sunlight (overcooling/overheating)
- Incorrect or stuck HVAC blower operation related to sun load
- Warning or message related to climate control or sensor on instrument cluster (depending on model)
- Stored B1260 DTC and possibly related HVAC faults
- Live-data sun sensor value remains at or near zero
What to check
- Read and record freeze-frame/live-data with a scan tool; confirm B1260 is current and note related codes
- Visually inspect solar sensor (usually on top of dashboard under windshield) and wiring harness for damage, pinched wires or water ingress
- Inspect connector for corrosion, bent pins, and proper locking
- Back-probe signal, 5V reference and ground with ignition ON (engine off) using a multimeter
- Check resistance between the sensor signal wire and chassis ground with ignition OFF (should be high/OL if not shorted)
- Wiggle harness and connectors while watching live data to reproduce the fault
Signal parameters
- Reference supply: typically +5 V reference (verify factory wiring diagram)
- Signal output: ~0 to 5 V proportional to solar irradiance (at strong sun near upper range)
- Short to ground condition: signal near 0 V with key on (0.0–0.5 V)
- Expected resistance from signal wire to chassis ground (ign off): very high / open (>> megaohms) if no short
Diagnostic algorithm
- Retrieve codes and live data with a manufacturer-level scan tool. Confirm B1260 and freeze-frame conditions. Clear codes and see if B1260 returns.
- Visually inspect the sensor and harness at the dash top for damage, water intrusion, pinched wires or connector corrosion. Repair any obvious damage.
- With ignition ON (engine off), back-probe the sensor connector: verify reference voltage (≈5 V) and sensor ground. If reference is missing or low, trace supply or fused feed. If reference present but signal ≈0 V, suspect short to ground or failed sensor.
- With ignition OFF, measure resistance between the signal wire (at the sensor connector) and chassis ground. A low resistance indicates a short to ground in the sensor or harness. If high resistance (open), the short may be intermittent—perform wiggle test with key on while watching live data.
- Disconnect the sensor connector. With key ON, check the signal wire voltage at the harness side: if the voltage rises toward the reference (or float) when sensor disconnected, the sensor is likely shorted internally. If signal remains ~0 V, short is in the wiring between harness and module—trace wiring and check grounds/connectors.
- If wiring appears intact, unplug the HVAC/body control module connector and measure continuity between the signal wire and module pin to isolate section with short. Repair any chafed wiring, replace corroded connector pins or repair pinouts per wiring diagram.
- Replace the solar radiation sensor if internal short is confirmed. After repair, clear codes and verify correct live-data values under sunlight and that code does not return.
- If fault persists after sensor and wiring repair, inspect/replace control module connector or consult module-level diagnostics; consider module substitution only after wiring and sensor verified.
- Use manufacturer wiring diagrams and connector views for pin identification and torque/specs when replacing parts.
Likely causes
- Shorted signal wire to chassis ground due to wiring chafe under dash
- Corroded connector causing low-resistance path to ground
- Failed internal sensor electronics creating direct path to ground
Fault status
Status
Solar radiation sensor circuit — short to ground. Fault stored by HVAC/body control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1260
LAND ROVER
B — Body
Solar radiation sensor - short circuit in the battery
Views:
UK: 4
EN: 7
RU: 8
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with conductor contacting chassis ground
- Corroded/loose connector at the solar sensor
- Internal short inside the solar radiation sensor
- Water ingress or contamination at connector or sensor
- Poor pin contact or bent terminal in connector
- Faulty HVAC/body control module or wiring connector at the module (less common)
Symptoms
- Auto climate control not responding correctly to sunlight (overcooling/overheating)
- Incorrect or stuck HVAC blower operation related to sun load
- Warning or message related to climate control or sensor on instrument cluster (depending on model)
- Stored B1260 DTC and possibly related HVAC faults
- Live-data sun sensor value remains at or near zero
What to check
- Read and record freeze-frame/live-data with a scan tool; confirm B1260 is current and note related codes
- Visually inspect solar sensor (usually on top of dashboard under windshield) and wiring harness for damage, pinched wires or water ingress
- Inspect connector for corrosion, bent pins, and proper locking
- Back-probe signal, 5V reference and ground with ignition ON (engine off) using a multimeter
- Check resistance between the sensor signal wire and chassis ground with ignition OFF (should be high/OL if not shorted)
- Wiggle harness and connectors while watching live data to reproduce the fault
Signal parameters
- Reference supply: typically +5 V reference (verify factory wiring diagram)
- Signal output: ~0 to 5 V proportional to solar irradiance (at strong sun near upper range)
- Short to ground condition: signal near 0 V with key on (0.0–0.5 V)
- Expected resistance from signal wire to chassis ground (ign off): very high / open (>> megaohms) if no short
Diagnostic algorithm
- Retrieve codes and live data with a manufacturer-level scan tool. Confirm B1260 and freeze-frame conditions. Clear codes and see if B1260 returns.
- Visually inspect the sensor and harness at the dash top for damage, water intrusion, pinched wires or connector corrosion. Repair any obvious damage.
- With ignition ON (engine off), back-probe the sensor connector: verify reference voltage (≈5 V) and sensor ground. If reference is missing or low, trace supply or fused feed. If reference present but signal ≈0 V, suspect short to ground or failed sensor.
- With ignition OFF, measure resistance between the signal wire (at the sensor connector) and chassis ground. A low resistance indicates a short to ground in the sensor or harness. If high resistance (open), the short may be intermittent—perform wiggle test with key on while watching live data.
- Disconnect the sensor connector. With key ON, check the signal wire voltage at the harness side: if the voltage rises toward the reference (or float) when sensor disconnected, the sensor is likely shorted internally. If signal remains ~0 V, short is in the wiring between harness and module—trace wiring and check grounds/connectors.
- If wiring appears intact, unplug the HVAC/body control module connector and measure continuity between the signal wire and module pin to isolate section with short. Repair any chafed wiring, replace corroded connector pins or repair pinouts per wiring diagram.
- Replace the solar radiation sensor if internal short is confirmed. After repair, clear codes and verify correct live-data values under sunlight and that code does not return.
- If fault persists after sensor and wiring repair, inspect/replace control module connector or consult module-level diagnostics; consider module substitution only after wiring and sensor verified.
- Use manufacturer wiring diagrams and connector views for pin identification and torque/specs when replacing parts.
Likely causes
- Shorted signal wire to chassis ground due to wiring chafe under dash
- Corroded connector causing low-resistance path to ground
- Failed internal sensor electronics creating direct path to ground
Fault status
Status
Solar radiation sensor circuit — short to ground. Fault stored by HVAC/body control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B1260
Other
B — Body
Solar Radiation Sensor Circuit Short To Battery
Views:
UK: 15
EN: 24
RU: 24
AI status
Completed
Completed
100%
Causes
- Damaged or chafed wiring harness with conductor contacting chassis ground
- Corroded/loose connector at the solar sensor
- Internal short inside the solar radiation sensor
- Water ingress or contamination at connector or sensor
- Poor pin contact or bent terminal in connector
- Faulty HVAC/body control module or wiring connector at the module (less common)
Symptoms
- Auto climate control not responding correctly to sunlight (overcooling/overheating)
- Incorrect or stuck HVAC blower operation related to sun load
- Warning or message related to climate control or sensor on instrument cluster (depending on model)
- Stored B1260 DTC and possibly related HVAC faults
- Live-data sun sensor value remains at or near zero
What to check
- Read and record freeze-frame/live-data with a scan tool; confirm B1260 is current and note related codes
- Visually inspect solar sensor (usually on top of dashboard under windshield) and wiring harness for damage, pinched wires or water ingress
- Inspect connector for corrosion, bent pins, and proper locking
- Back-probe signal, 5V reference and ground with ignition ON (engine off) using a multimeter
- Check resistance between the sensor signal wire and chassis ground with ignition OFF (should be high/OL if not shorted)
- Wiggle harness and connectors while watching live data to reproduce the fault
Signal parameters
- Reference supply: typically +5 V reference (verify factory wiring diagram)
- Signal output: ~0 to 5 V proportional to solar irradiance (at strong sun near upper range)
- Short to ground condition: signal near 0 V with key on (0.0–0.5 V)
- Expected resistance from signal wire to chassis ground (ign off): very high / open (>> megaohms) if no short
Diagnostic algorithm
- Retrieve codes and live data with a manufacturer-level scan tool. Confirm B1260 and freeze-frame conditions. Clear codes and see if B1260 returns.
- Visually inspect the sensor and harness at the dash top for damage, water intrusion, pinched wires or connector corrosion. Repair any obvious damage.
- With ignition ON (engine off), back-probe the sensor connector: verify reference voltage (≈5 V) and sensor ground. If reference is missing or low, trace supply or fused feed. If reference present but signal ≈0 V, suspect short to ground or failed sensor.
- With ignition OFF, measure resistance between the signal wire (at the sensor connector) and chassis ground. A low resistance indicates a short to ground in the sensor or harness. If high resistance (open), the short may be intermittent—perform wiggle test with key on while watching live data.
- Disconnect the sensor connector. With key ON, check the signal wire voltage at the harness side: if the voltage rises toward the reference (or float) when sensor disconnected, the sensor is likely shorted internally. If signal remains ~0 V, short is in the wiring between harness and module—trace wiring and check grounds/connectors.
- If wiring appears intact, unplug the HVAC/body control module connector and measure continuity between the signal wire and module pin to isolate section with short. Repair any chafed wiring, replace corroded connector pins or repair pinouts per wiring diagram.
- Replace the solar radiation sensor if internal short is confirmed. After repair, clear codes and verify correct live-data values under sunlight and that code does not return.
- If fault persists after sensor and wiring repair, inspect/replace control module connector or consult module-level diagnostics; consider module substitution only after wiring and sensor verified.
- Use manufacturer wiring diagrams and connector views for pin identification and torque/specs when replacing parts.
Likely causes
- Shorted signal wire to chassis ground due to wiring chafe under dash
- Corroded connector causing low-resistance path to ground
- Failed internal sensor electronics creating direct path to ground
Fault status
Status
Solar radiation sensor circuit — short to ground. Fault stored by HVAC/body control module.
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?
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