Mystery Battery Draw Can Drain Your Productivity - BodyShop Business

Mystery Battery Draw Can Drain Your Productivity

A vehicle you repair that seems "good to go" can sometimes come back to haunt you with concerns that may or may not be related to the repair.

How much time is wasted in your shop tracking down obscure problems and fixing them? A vehicle you repair that seems “good to go” can sometimes come back to haunt you with concerns that may or may not be related to the repair. Electronic and electrical systems can especially generate hard-to-diagnose problems.

Factory information is the answer. In many cases, a factory technical service bulletin (TSB) has been published that provides a quick solution to a known defect or issue.

Customers frequently come back, honestly believing that your repair is the cause of some new problem. But the problem may be a previously diagnosed “glitch” known to exist on a particular vehicle. Armed with OE information, you can protect your shop and generate additional revenue by fixing the problem – not to mention enhance your relationship with the customer.

Here’s an excerpt from a TSB published by Toyota describing an electrical problem with some 2011
Sienna vans.

Condition

Some 2011 Sienna vehicles’ batteries may lose their charge overnight even though they were properly closed and locked with the interior lights turned off. In the event that a parasitic draw exceeding two amps is discovered and the A/C compressor clutch is confirmed to remain on with the ignition off, this bulletin provides a repair procedure involving circuit inspection and replacement of the integration relay.

Models
Certain 2011 Toyota Sienna vans produced before the production change effective VINs shown below.

 DRIVETRAIN PRODUCTION CHANGE
EFFECTIVE VIN
 2WD  5TDKA3DC#BS008690
 5TDZK3DC#BS162223
 5TDKK3DC#BS162223
 5TDXK3DC#BS162223
 5TDYK3DC#BS162223
 4WD  5TDJK3DC#BS027553
 5TDDK3DC#BS027553

Parts Information

 PREVIOUS P/N  CURRENT P/N
 PART NAME
 QTY
 82641-08050  82641-08071  Relay, Integration  1
 82641-08030  82641-08080  Relay, Integration  1
 82641-08040  82641-08090  Relay, Integration  1
 82641-08060  82641-08100  Relay, Integration  1


Required Tools & Equipment
Manufacturer’s diagnostic scan equipment or suitable equivalent.

Applicable Warranty

  • This repair is covered under the Toyota Comprehensive Warranty, which is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
  • Warranty application is limited to occurrence of the specified condition described in this bulletin.

Service Information
Always refer to ALLDATA Collision for safety procedures, identification of material types, recommended refinish materials, removal and installation procedures. Always refer to the manufacturer for questions relating to applicable or non-applicable warranty repair information.

figure 1 - b41 connectorInspection Procedure
1. Confirm the vehicle is produced before the VINs listed in the table to the left.
2. If an abnormally high parasitic draw of approximately two amps is confirmed with ignition key in the “OFF” position, proceed to Step 3.
3. With the ignition key in the “OFF” position, disconnect connector B41 and verify the A/C clutch audibly clicks “OFF.” If a click is heard, proceed to Step 4 (Figure 1).
4. From the front side of the connector, confirm battery voltage on A/C clutch B41 connector. If battery voltage is present, proceed to Step 5.
5. Replace Integration Relay.

Integration Relay Replacement
figure 2 1. Release the black retaining tabs at the top of the relay using a pick or blade screwdriver (Figure 2).
2. Grasp and pull straight up on the integration relay after both tabs are released.
3. Release all three connectors at the bottom of the integration relay (Figure 3).
Figure 34. Connect all three connectors into the bottom of the new integration relay and push the relay assembly down into the junction block until both black tabs click into place.
5. Confirm normal compressor clutch on/off operation with engine running and A/C on, and with vehicle turned off.


Dan Espersen is ALLDATA’s senior collision program manager and holds an AA Degree in automotive technology. He has 46 years of experience in the automotive industry, including 19 in the collision industry.

You May Also Like

Auto Glass: An Industry Shattered

The business model of mobile auto glass replacement has given way to brick-and-mortar locations to accommodate windshield calibrations on vehicles equipped with ADAS.

The auto glass industry, like all segments of the automotive industry, has changed over the past few years due to advancements in electronics technology in vehicles, particularly advanced driver-assistance systems (ADAS). With the proliferation of these systems in vehicles today, auto glass has had to rework the business model it has followed for many years. Calibrations and requirements for the space they’re performed in, such as level surface, lighting, etc., have drastically changed how the entire automotive repair industry operates. Mobile auto glass replacement, where customers could get a windshield replaced at their home or place of work, was the norm for so many years. Now, however, it has given way to brick-and-mortar locations to accommodate the static calibration process for windshield replacement on vehicles equipped with ADAS.  

Navigating the Intricate Landscape of Coatings and ADAS

With refinish and ADAS, the theme time and time again comes back to: check the OEM repair recommendations.

Maximize Your Scan Tool

Are you maximizing your scan tools to their full potential? Don’t let them be just an expensive code reader.

Networking: Is It a Car or Computer?

Understanding vehicle electronics will be a necessity for all shops in order to not only repair the vehicle but justify the costs.

Topology and Your Scan Tool

Topology influences how you access modules with your scan tool.

Other Posts

The Digital Transformation of Collision Repair

The strategic integration of digital tools and technologies in body shops is becoming the new refinish industry benchmark.

Multimeter Accuracy: How Important Is It?

Multimeter accuracy is critical for EV diagnostics.

ADAS Calibration: Accuracy is Critical

For an ADAS system to operate to its full potential, it must be calibrated with the greatest accuracy possible.

Chassis Alignment: A Challenging Diagnostic Process

The source of the complaint can be the angles, electronics or tires.

An auto technician performing a wheel alignment.