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B1318 B0xxx · ボディ (B) 重大度中
System Voltage Low (Body Module)
The body module has seen supply voltage below its operating threshold. Always find the cause — a weak battery sets this long before it fails to start.
重大度の目安： 中 — 走行性または排出ガスに影響。今週中に点検を予約してください
確認できる症状
- Intermittent electrical faults
- Central locking or windows slow
- Warning lamps on start-up
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Weak or failing battery
- 2 Loose or corroded earth
- 3 High resistance in the main supply
- 4 Parasitic drain
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ Load-test the battery — do not trust an open-circuit voltage reading.
- ✓ Measure voltage drop across the main earth and supply while cranking.
- ✓ Check for a parasitic drain if the fault appears after parking.
- ✓ Inspect the earth points under the dash and in the engine bay.
修理の選択肢
- Replace the battery
- Clean and torque the earth points
- Find and remove the parasitic drain
B1318 — よくあるご質問
The battery reads 12.4 V — is that fine? +
Only a load test tells you. A battery can read healthy at rest and collapse under starter load.
Will a new battery clear the code? +
It will stop the cause, but you still need to clear stored codes and re-check after a few cold starts.