B150E87

Code

VOLVO B — Body

Defog Sensor. Missing Message

Brand: VOLVO

Type: B — Body

Views: UK: 11 EN: 21 RU: 16

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Page language: EN

Read all modules with a capable scan tool; record DTCs and freeze frame
Verify vehicle battery voltage and fuses for HVAC/sensor circuit
Check for presence of the defog sensor message on the bus using a diagnostic tool or CAN/LIN data logger
Visually inspect sensor connector and wiring for corrosion, damage or water ingress
Backprobe sensor connector to check for proper power, ground and signal (if applicable)
Inspect related modules (HVAC control module, body/gateway) for additional comms faults

Communication type: typically a network message (CAN or LIN) rather than an analog voltage
Expected message: periodic update from defog/condensation sensor (frequency typically ~1 Hz or faster)
Bus speeds: vehicle CAN commonly 250–500 kbps; message should appear on bus when ignition on
Power: sensor may require switched 12 V and a ground; voltage should be near battery voltage with ignition on

Retrieve and record all DTCs from all modules. Note time since code set and any related network codes.
Clear codes and perform an ignition cycle to see if B150E87 returns and under what conditions.
Use a scan tool to watch live data and verify whether the defog sensor data/message is present and updating.
If no message, inspect the sensor connector and harness for corrosion, bent pins, or water damage. Repair as needed.
Verify sensor supply and ground at the connector with a meter. If power/ground missing, trace and repair fuse, relay or wiring.
Check continuity between sensor and HVAC/gateway control module connector pins. Repair any opens/shorts.
If wiring and power are good, replace the defog sensor with a known-good unit and re-test communication.
If sensor replacement does not restore message, investigate module network interface (CAN/LIN) and related modules. Use scope or CAN bus tool to verify bus integrity and message IDs.
If network fault or module software is suspect, check for technical service bulletins and perform module reprogramming or replacement per manufacturer guidance.
After repairs, clear codes and verify normal operation and message presence during driving/test cycles.

⚠️ Status

Defog sensor message missing on vehicle network — defog/condensation sensor data not received.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Repair manuals

Manual library for VOLVO

221

Browse 221 VOLVO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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