Car has no power at all

Tiny
ANTHONY44
  • MEMBER
  • 2008 VOLKSWAGEN JETTA
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Something is draining my battery. I have no headlights after replacing the switch both headlight assembly’s. Anyways I pulled it in to try and figure out what was draining the battery now it has no power at all.
Do you
have the same problem?
Yes
No
Sunday, December 15th, 2019 AT 4:23 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

First, are you sure the battery is good and the terminals are clean and tight? Have you checked the main grounds from the battery to the engine block and body? Does anything work on the vehicle?

I know there was a technical service bulletin (TSB) put out regarding battery draw issues. Here it is. Take a look through it to see if it helps. Also, the attached pictures correlate with the directions.

________________________________

2008 Volkswagen Jetta Sedan (1K2) L5-2.5L (CBUA)
Battery - Current Draw Information
Vehicle Battery - Current Draw Information
BATTERY - CURRENT DRAW INFORMATION
27 07 11

October 2, 2007

2016076, Supersedes Technical Bulletin Group 27 number 07-10 dated September 18, 2007 due to clarification

pic 1

Vehicle Information

Condition

Battery, Discharged, Diagnosis for Excessive Static Current Draw

Technical Background

One or more of the following symptoms is possible.

Discharged battery

Engine does not start because of low battery voltage

Voltage display in the combination instrument displays too low
"Low battery" fault codes in various control modules.

Production Solution

Battery/ Current draw procedure introduced in VAS 5051A/B scan tool with the release of software version 11.78.00.

Service

Tip:
Refer to ElsaWeb for other Technical Bulletins that apply to specific vehicles with discharged batteries. These Technical Bulletins provide information about intermittent faults and correct battery testing /charging procedures.

Note:
Perform ALL STEPS, to systematically test for faults and to avoid repeat repairs.

Note:
The power supply to vehicle must not be cut off. DO NOT perform terminal 30 reset. DO NOT remove or disconnect battery, battery cables or fuses.

Check the fault memory.

Compare control units on the fault memory print-out with vehicle equipment (PR numbers). Are all necessary control units listed on the print-out? Any control units not listed may be faulty and could be indications for the further fault finding.

Check which non-genuine parts are installed, e.G. Tow bar, animal protection, radio, DVD, etc. If an increased closed-circuit current is found, check these components first.

Step 1: Verify Battery Condition

1. Connect Midtronics INC-940 to battery

2. Check and/or charge battery based on applicable Technical Bulletin

3. If INC-940 test fails battery, replace battery before continuing

Step 2: Verify Sleep State Current

1. Connect 50 amp current clamp to VAS 5051A/B

2. Calibrate the current clamp

3. Connect current clamp to negative battery cable with arrow pointing away from battery.

Tip:
Current flows out of the battery to the chassis of the vehicle

4. Close all doors, trunk, or hood latch so vehicle control units detect all doors closed

5. Arm vehicle anti-theft system with remote

Tip:
If vehicle has easy entry handles then it is necessary to keep clear of all handles to avoid bus communication/wakeup message.

On vehicles equipped with air suspension, after engine is turned off, the system will stay in standby for up to five minutes

pic 2

6. Observe sleep state current draw after vehicle is left untouched for TWO HOURS.

7. If after two hours the vehicle exceeds maximum sleep state current draw, proceed to Step 3: Consuming Circuit Isolation. If vehicle does not exceed maximum sleep state current draw, perform a long term (overnight)
measurement test. Record the long term measurement using MIN/MAX setting of scan tool.

Excessive current = Measured current > nominal sleep current

Tip:
Periodic spikes in current draw are normal

Step 3: Consuming Circuit Isolation

Tip:
Due to the state of the CAN Bus communications in the vehicle, it is no longer acceptable to pull each individual fuse one at a time to try and identify which circuit is consuming current. Removal/ reinsertion of a fuse while vehicle is in a sleep state may wake the bus of the vehicle, and invalidate the test. Identifying "consuming" circuits must be done by measuring a voltage drop across fuse and aligning with the value in matrix located at end of this document.

Starting at interior fuse boxes, perform the following tasks:

Tip:
Use VAS 5051A/B multimeter function, Fluke 83 multimeter, or equivalent.

Pic 3

Use "mV" scale on meter

Measure voltage drop across fuse by placing the positive lead on one side of the fuse and negative lead on other side.

Take absolute value of reading of voltage drop (ignore negative signs) and then reference voltage drop chart to determine how much current the circuit is currently consuming. See Identifying Current Consumption
with Matrix attachment.

Check all fuses until fuse with approximate excessive current draw is identified

Tip:
Excessive current = Measured current > nominal sleep current

Identification of component:

1. Once fused circuit is identified, use service repair and wiring diagram information in ElsaWeb to identify all components on circuit

2. Disconnect components from the circuit one by one and allow sleep current to stabilize after each elimination.

3. Measure vehicle current consumption and voltage drop across fuse once again. If within normal range, as specified in the table (see Current Consumption Matrix attachment), the component with excessive consumption is identified.

4. Repeat steps above until component is identified causing excessive current draw.

Warranty

Information only.

Required Parts and Tools

No Special Parts required.

No Special Tools required.

Additional Information

All part and service references provided in this Technical Bulletin are subject to change and/or removal. Always check with your Parts Dept. And Repair Manuals for the latest information.

Pic 4

Identifying Current Consumption with Matrix

pic 5

pic 6

Current Consumption Matrix

_____________________________________________

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Sunday, December 15th, 2019 AT 8:00 PM
Tiny
ANTHONY44
  • MEMBER
Pretty sure I found my problem thanks.
Was this
answer
helpful?
Yes
No
Monday, December 16th, 2019 AT 10:14 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Wow! I think you did too. Let me know if you need anything other.

Take care and have a good holiday.

Joe
Was this
answer
helpful?
Yes
No
Monday, December 16th, 2019 AT 12:31 PM
Tiny
ANTHONY44
  • MEMBER
Do you know if I replace control module can I just start the car or will it need reprogrammed?
Was this
answer
helpful?
Yes
No
Saturday, December 21st, 2019 AT 11:00 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
It will need programming specific to the immobilizer. It must be activated for it to work.
Was this
answer
helpful?
Yes
No
Saturday, December 21st, 2019 AT 11:04 PM
Tiny
ANTHONY44
  • MEMBER
I have changed ignition switch control module ECM and all the relays and still can t get my car to start. Battery is good starter spins when I tested it changed all fusible links all fuses are good but I don t get power to some of them. When I turn the key on nothing happens; no lights on the dash, no clicks. I m ready to burn it to the ground.
Was this
answer
helpful?
Yes
No
Monday, December 30th, 2019 AT 5:19 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Do you mean you aren't getting power to the fuses? Have you removed the box to check for a problem behind it?
Was this
answer
helpful?
Yes
No
Tuesday, December 31st, 2019 AT 8:05 PM

Please login or register to post a reply.

Sponsored links