What does it mean?
B1487 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Channel 8 Audio Speaker Output Circuit Shorted Together .
Symptoms
- The channel 8 speaker goes completely silent
- The amplifier shuts that channel down or drops the whole system into protection for a moment
- Audio cuts out at higher volume and returns when the level is reduced
- Amplifier housing becomes warm after a period of playing
- Code sets within seconds of switching the audio system on
Likely causes
- Loom crushed by a trim clip, screw or seat rail, letting both conductors touch
- Insulation rubbed through where the pair crosses a sharp edge or passes through a grommet
- Bent spade terminal or a stray strand bridging the two speaker connections
- Corrosion or water inside a connector joining the two pins
- Leads twisted together or joined at a bad splice during an aftermarket installation
- Internal short in the speaker itself
- Failed amplifier output stage producing the same reading
How to fix it
- Use fader and balance to confirm which speaker is affected
- Disconnect both ends of the circuit and measure between the two output wires with the speaker unplugged; a near-zero reading proves a short in the harness
- If the harness is clean, measure across the speaker terminals and compare with the specified impedance
- Remove trim along the route and look for crush marks, screws through the loom, chafe at grommets and previous repairs
- Inspect both connectors for bent spades, stray strands and green corrosion
- Repair the damaged section with proper insulation and clip the loom clear of the crush point
- Replace the speaker only if it measures shorted on its own
- Clear the code, play at normal and high volume and confirm the channel remains active