Code
B150315
VOLVO
B — Body
Left Side Sun Sensor. Circuit Short To Battery or Open
Views:
UK: 21
EN: 26
RU: 22
AI status
Completed
Completed
100%
Causes
- Wiring shorted to battery positive (chafed/abraded harness contacting a live conductor)
- Open circuit from broken wire, damaged connector pin, or connector corrosion
- Failed sun sensor (internal short or open)
- Poor/crimped connector or pushed-out terminal
- Water intrusion or corrosion at the sensor or connector
- Incorrect aftermarket work or recent repair damaging the harness
Symptoms
- DTC B150315 stored in vehicle fault memory
- Automatic climate control may not compensate correctly for sunlight (uneven cabin temperature or wrong blower/temperature adjustments)
- Possible diagnostic message in the vehicle information display related to sun sensor
- Intermittent operation when harness is moved
- No obvious operation from the sensor (signal stuck high or low)
What to check
- Scan and record freeze frame and live data for the sun sensor channel if available
- Visually inspect the left sun sensor and connector for damage, corrosion, or water ingress
- Inspect harness routing for chafing, pinches, or recent repair sections
- Check for aftermarket wiring or components near the harness that may have been connected incorrectly
- Check relevant fuses and related power supplies
- Backprobe connector to measure reference voltage and signal with ignition ON (do not short terminals)
Signal parameters
- Reference voltage (typical): ~4.5–5.5 V (sensor reference feed from control module) — confirm with wiring diagram
- Signal output (typical): 0–5 V proportional to light intensity (dark ~0–1 V, bright sun ~2.5–5 V) — may vary by model
- Short-to-battery condition: signal or reference line measures battery voltage (~12 V) or near battery voltage
- Open-circuit condition: signal line measures high impedance or 0 V (no reference/signal)
- Connector pin voltages should match values in the model-specific wiring diagram
Diagnostic algorithm
- Read and record codes and live data. Note whether the code is continuous or intermittent. Clear the code and re-scan to confirm persistence.
- Perform a thorough visual inspection of the left sun sensor, connector, and harness routing for damage, corrosion, or evidence of water ingress.
- With ignition ON (engine off), backprobe the sensor connector: verify the presence and correct level of reference voltage (≈5 V) and measure the sensor output. Compare to expected signal ranges.
- If the sensor output reads near battery voltage, suspect a short to battery. With ignition OFF, isolate the sensor connector and measure continuity between the signal/reference wire and battery positive to locate the short.
- If the signal reads 0 V or open, check continuity from the sensor connector to the control module pin. Repair any open circuit (broken wire, bad terminal) found.
- Inspect and wiggle the harness while observing live data to detect intermittent shorts/opens. Pay attention where harness passes through body panels or near sharp edges.
- If wiring and connector are good, disconnect sensor and measure resistance/continuity of the sensor per manufacturer test procedure. Replace sensor if out of specification.
- After repairing wiring or replacing sensor, clear codes and perform a functional test/road test to confirm the fault does not return.
- If fault persists after verifying harness and sensor, consult model-specific wiring diagrams and consider controlled bench tests or module-level diagnosis before replacing control modules.
Likely causes
- Corroded or water-damaged sensor connector
- Damaged/chafed wire contacting battery feed somewhere along harness
- Sensor failure (internal short to battery or open element)
- Loose or pushed-out terminal in the sensor or module connector
Fault status
Status
Left sun sensor circuit — short to battery or open. Sensor signal out of expected range; climate/comfort system may not respond correctly. Inspect sensor, connector and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Repair manuals
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17
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