B0289

Code

Generic B — Body

Body Control Module — Peripheral Module Communication Lost

Brand: Generic

Type: B — Body

Views: UK: 3 EN: 4 RU: 2

AI status

Completed

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Page language: EN

Causes

Open or shorted communication bus (CAN/LIN) wiring
Faulty or unpowered peripheral module
Intermittent connector or harness damage (corrosion, broken wires)
Missing or blown fuse/relay supplying module or bus transceiver
Failed BCM or bus transceiver inside a module

Symptoms

Related peripheral features non-functional (door locks, mirrors, lighting, etc.)
Multiple communication-related DTCs present or 'module not available' messages on a scan tool
Intermittent operation of devices controlled by the missing module
No live data/messages from the peripheral when scanned
Possible battery drain or erratic behavior if bus awake/shutdown signals are incorrect

What to check

Use a scan tool to read all modules and note which modules report communication errors
Check battery voltage and main fuses/relays for BCM and target peripheral
Visually inspect connectors and harnesses for corrosion, pin damage or chafing (hinges, doors, trunk area)
Backprobe and measure CAN_H/CAN_L or LIN at the peripheral connector with ignition on
Check for expected bus termination resistance across CAN_H-L (≈60 ohms) with power off
Wiggle harness/connectors while monitoring communication for intermittent faults

Signal parameters

CAN idle voltages (approx): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state typically CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
Differential CAN bus idle voltage ≈ 0 V; active differential typically ~2 V (varies by vehicle)
LIN bus idle: near battery voltage when recessive; bus driven low by master during frames
Expected message frequency: peripheral modules normally transmit periodic status messages — use OEM data or known-good vehicle for reference
Bus termination: typical CAN total across vehicle ≈ 60 ohms (two 120 Ω in parallel)

Diagnostic algorithm

Record all DTCs and freeze frame data with a scan tool; note which module(s) report lost communication
Verify battery voltage (≥12 V) and inspect fuses/relays powering BCM and peripheral
Visually inspect and physically manipulate wiring/connectors to the reported peripheral—pay attention to high-flex areas (doors, trunks, hinges)
Backprobe the communication pair at the peripheral connector with ignition ON. Verify idle voltages and observe for message activity with a CAN/LIN capable scan tool or oscilloscope
Measure termination resistance across CAN_H and CAN_L with ignition off; expect ~60 Ω total. If open or incorrect, trace missing termination to module or harness
Isolate the problem by checking if other modules on the same bus communicate. If all modules lost, suspect bus power/ground/termination. If only one module absent, focus on that module’s power/ground and its connector wiring
If wiring and power/ground are good but no messages are present, try swapping or bench-testing the peripheral module (if possible) or substitute a known-good module
Clear codes and road test to verify repair. If intermittent, use a data logger/oscilloscope to capture failures during the symptom event
Do not replace BCM until wiring, connectors, and peripheral module operation are confirmed; replacement only after eliminating external causes

Likely causes

Damaged or disconnected connector at the peripheral (doors, liftgate, mirror)
Faulty ground or supply to the peripheral module
Short to battery or chassis on CAN/LIN wiring near hinge or body harness
Failed transceiver in peripheral module or BCM
Improper bus termination (missing/incorrect CAN 60 Ω)

Fault status

⚠️ Status

Communication to peripheral module lost: BCM did not receive expected messages from peripheral on CAN/LIN. Stored when message timeout exceeded or no bus activity detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours