2006 Honda Odyssey Parasitic Draw Testing

Summary

In this video, a mechanic addresses a 2006 Honda Odyssey's persistent battery drain issue. After installing a temporary battery disconnect switch and using an ammeter, they identify a parasitic draw of nearly one amp. Through a series of tests, including scanning for error codes and checking fuses, they pinpoint the problem to a faulty circuit related to the left power sliding door control unit. By disabling this circuit, they successfully reduce the parasitic draw to an acceptable level, resolving the battery drain issue.

Takeaways

• 🔍 The 2006 Honda Odyssey has a parasitic draw issue, causing the battery to go dead frequently.
• 🔧 A marine battery disconnect was used as a temporary fix by another shop, which the mechanic plans to replace with a proper test.
• 🔋 The vehicle's battery has been changed multiple times without resolving the parasitic draw.
• 📈 The mechanic uses an ammeter to measure the current draw, initially finding a significant 980 milliamps.
• ⏱ After waiting, the draw drops to 400 milliamps, indicating a persistent issue.
• 🔌 The mechanic identifies a problematic 7.5-amp fuse related to the power windows, memory seat, wiper washer, immobilizer, gauge control module, and navigation system.
• 🔍 After removing the faulty fuse, the draw drops significantly to 8 milliamps, suggesting the issue is with a device or system connected to this fuse.
• 🔗 The mechanic traces the parasitic draw to the rear junction box and a specific circuit related to the power tailgate and left sliding door.
• 🛠 The left power sliding door control unit is identified as the source of the issue, with a parasitic draw even when disabled.
• 🔄 The mechanic disables the problematic circuit by 'd-pinning' a wire, reducing the draw to an acceptable level.
• 🚫 The customer agrees to leave the left sliding door non-operational due to the cost of repair, accepting the use of the right sliding door only.

Q & A

What is the issue with the 2006 Honda Odyssey mentioned in the script?

The 2006 Honda Odyssey has a parasitic draw issue, causing the battery to go dead intermittently over the last few years.

What was the temporary fix attempted by another shop for the parasitic draw?

Another shop installed a marine battery disconnect as a temporary fix for the parasitic draw issue.

What method does the technician use to measure the parasitic draw?

The technician uses an ammeter connected in series across the disconnect switch to measure the parasitic draw.

What was the initial reading on the ammeter when the parasitic draw was first measured?

The initial reading on the ammeter was 980 milliamps, which is almost one amp of current flow.

What additional tool does the technician use to diagnose the issue further?

The technician uses a scanner interface to check for any fault codes or modules that are awake.

What fault codes were found when the technician scanned the vehicle?

The technician found a battery voltage failure in the ABS module and a battery voltage high in the ABS module, likely due to the disconnect switch. There was also no signal from the satellite safety sensor.

Which fuse was identified as potentially causing the parasitic draw?

The 7.5 amp fuse in the fuse panel, which is the backup fuse, was identified as potentially causing the parasitic draw.

What components are fed by the 7.5 amp fuse that was causing the draw?

The 7.5 amp fuse feeds the power window master switch, memory seat switch, wiper washer switch, immobilizer control unit, gauge control module, navigation computer, navigation system, and the rear junction box.

What was the final parasitic draw after identifying and disabling the problematic circuit?

The final parasitic draw was reduced to 25 to 30 milliamps, which is an acceptable level.

What component was ultimately disabled to resolve the parasitic draw issue?

The left power sliding door control unit was disabled to resolve the parasitic draw issue, as it was not in use and fixing it would be expensive.

What was the customer's response to disabling the left sliding door control unit?

The customer was okay with disabling the left sliding door control unit since it hadn't been working for some time, and they were manually using it.