Electrical - No Start/Electrical Systems Malfunctions: Overview
Group: 27Number: 05-06
Date: Nov. 15, 2005
Subject:
Intervention Load Management
Model(s):
Phaeton 2004 --> 2006
Supersedes T.B. Group 27 number 05-04 dated August 12, 2005 due to correction to Overview Table (Phaeton Load Intervention - Operation Overview) (see arrow).
Condition
^ Electrical consumer malfunctions
^ Message in MFI alerting driver that electrical consumers are being shut down
^ Vehicle will not start
Load Intervention
Intervention Load Management (Load Intervention) is a condition set by the Vehicle Electrical System Control module -J519- (Electronic Central Electrics Module) due to low battery voltage falling below a specified period of time. Results of this condition being set by the Vehicle Electrical System Control module -J519- may cause a number of other DTCs to be set by various control modules due to a malfunction in operation. Load Intervention is a Normal function of the Central Electrics Module in an attempt to preserve battery power for normal vehicle operation.
Tip:
DO NOT Attempt to use Guided Fault Finding (GFF) to correct this issue.
Load Intervention must be remedied first, before addressing any other faults (DTCs) set in memory or customer concerns. Failure to do so will result in misdiagnosis, unnecessary repairs or parts replacement. These unnecessary repairs will result in denied claims unless the load intervention issue is remedied first.
Overview of Operation
The Central Electrics Module controls the monitoring and initiation of Intervention Load Management Function. Based on conditions described in the "flow chart", Intervention Load Management may or may not be active. In the event that function is activated and consumers are being shut down, a message will be displayed, in the Multi Function Display (MFI), informing the driver that consumers are being shut down. This is normal operation of the Central Electrics module to preserve battery power for normal vehicle operation and allow the reduction of energy so the battery can recharge.
When electrical consumers are shut down, they are done in order, as specified by the following priority list.
1. Heating element in rear footwell flaps (25% reduction)
2. Rear defrost glass heating (50% reduction)
3. Heating element in rear footwell flaps (50% reduction)
4. Heated seats and ventilation (100% reduction)
5. Heating element in rear footwell flaps (75% reduction)
6. Windshield wipers park position heater (100% reduction)
7. Side mirror heating (100% reduction)
8. Heating element in rear footwell flaps (100% reduction)
9. Heated steering wheel (100% reduction)
10. Rear defrost glass heating (100% reduction)
11. HVAC fan (30% reduction)
12. Compressor shutoff (100% reduction)
If battery voltage continues to drop or can not be recovered, other DTCs may be set in memory from various control modules due to a low battery condition. Malfunctions may occur in other systems within the vehicle, which include, but not limited to:
1. Power Trunk operation
2. Memory Seats
3. Park Assist
4. Keyless Entry system
5. Sunroof operation
6. Tire Pressure monitor
Tip:
Failure to provide Diagnosis Log with warranty claim may result in a denied claim.
When procedure applies to vehicles with in the New Vehicle Limited Warranty, use the table.