B3A1D

Code

Generic B — Body

Battery Charger B

Brand: Generic

Type: B — Body

Views: UK: 23 EN: 27 RU: 25

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Page language: EN

Check for any other stored codes (powertrain, body, hybrid/EV control modules) with a scan tool and record freeze-frame data
Visually inspect charger B, connectors and wiring harness for damage, corrosion, loose pins or water intrusion
Verify fuses and relays for charger B; inspect for blown elements and proper relay operation
Measure supply voltage at charger B power input with key on and engine/vehicle in appropriate state
Measure charger B ground continuity back to chassis/ground point
Check for CAN/LIN communication between charger and control module (no bus errors, valid messages)

Charger B supply voltage present at module connector (key on / charge request): specified battery system voltage (12 V supply present)
Charger B enable/control signal: present (digital/PWM) when charge request issued by vehicle control
Charger B output voltage/current: within manufacturer spec when charging (for 12 V systems ~12–14.8 V; for HV chargers see vehicle-specific HV pack voltage/current ranges)
Temperature sensor values within expected range and not reporting fault
CAN/LIN messages from charger module: present and valid (no checksum or timeout errors)
Ground resistance: low (near 0 Ω) between charger ground terminal and chassis ground

Safety first: follow manufacturer high-voltage and battery-safe procedures before inspecting or working on chargers; isolate high-voltage system if applicable
Connect a diagnostic scanner and read all related DTCs and live data. Note when the code sets and any freeze-frame values
Perform a visual inspection of charger B and associated wiring harness and connectors for damage, corrosion, moisture, or rodent damage
Verify fuses and charging relays feeding charger B. Replace any blown fuses and bench-test relays if suspect
With vehicle in state that would enable charging, measure supply voltage at the charger B power input and verify ground continuity. Repair wiring or connectors if voltages are absent or grounds are high resistance
If supply and ground are good, verify control/enable signal and CAN/LIN communication to the charger. Repair bus wiring or module terminations as needed
If communications and control signals are present but charger does not operate, perform module-level self-tests (if available) and check for internal fault codes in charger module
If internal charger fault is confirmed and wiring/inputs are correct, replace or repair the charger B module per manufacturer procedure
After repair, clear codes, perform a charge cycle and road test to confirm the fault does not return and verify proper charging behavior