Polestar

Service and Parts Business

Technical Journal
TITLE:

Polestar: Checklist if 12 Volt battery is drained - Perform SW Upgrade
REF NO:

ISSUING DEPARTMENT:

CAR MARKET:

TJ 35542.2.0

Technical Service

United States and Canada

PARTNER:

ISSUE DATE:

STATUS DATE:

3 US 7515 Polestar

2023-01-05

2023-01-06

FUNC GROUP:

FUNC DESC:

3111

Battery, complete

Page 1 of 6

Attachment
File Name
Approved DTC’s.xlsx
TJ35542_Remote key backup.JPG

File Size
0.0105 MB
0.0318 MB

DESCRIPTION:
*If a customer complains of not being able to unlock the vehicle with the remote key and experiences no
start due to a drained 12 Volt battery, please follow instructions under “Service”.
An updated wake to charge 12V battery SW is available in VIDA since 22w50d3. This SW will limit the
risk of a drained 12v battery.
Description of the function:
The software in CEM has been optimized for Polestar 1.
When the vehicle is parked, CEM will wake up to check the State of Charge (SoC) level of the 12V
battery every sixth hour. If the charge level is deemed ok, CEM falls back to sleep.
If the check reveals that the calculated state-of-charge of the 12V battery is below 65%, CEM will start
energy conversion from the high voltage battery, charging the 12V battery up to 85% SoC. Once 85%
SoC of the 12V battery is reached, the charging cycle ends and CEM falls back to sleep.
The SoC check of the 12V battery repeats every 6h indefinitely as long as the vehicle remains parked in
abandoned mode. The SoC of the high voltage battery needs to be above ~2%. If the vehicle is plugged
in to a charger with power available, a conversion cycle will primarily use grid power to charge the 12V
battery.
CEM = Central Electronic Module

Produced and printed in the USA and available as an electronic document.
© Polestar 2020

Technical Journal 35542.2.0
CSC Customer Symptom Codes
Code
LM
LN

Description
12 V main battery/Dead battery
12 V main battery/Weak or low electrical power

DTC Diagnostic Trouble Codes
Vehicle Type
Type

Eng

232

Eng
Desc

Sales

Body

Gear

Steer

Model Year
2020-2021

Plant

Chassis range
-

Struc Week
Range
201939-202044

SERVICE:
*If the software is older than variant released 2022 week 50 day 3, perform a software upgrade in
accordance with TJ 35361.
Checklist customer inquire:
• Ask the customer when the vehicle was parked (date/time) and if the charge cable was connected or
not?
• Ask the customer if the green LED was illuminated after the charge cable was connected?
• When did the customer discovered that the battery was drained e.g. for how long had the car been
parked, and was there a DIM message pertaining to the problem?
• Was there any particular circumstances when the customer parked the car e.g. car was not locked/
locked, parking brake was applied, etc.?
Please contact your local technical helpdesk if you have trouble following the guided fault tracing
hereunder.
Initial checks:
• Check operation of the outer door handle’s push buttons, are they working as intended e.g. not
sticking, or/and returns to initial position?
• Is the car locked? Open it with the emergency key inside the keyfob. (Depending on the situation,
tow truck or technician at customers home)
• Put the key towards to RFID symbol (place the remote key in the back-up area according to attached
picture) Try to start the engine?
• Check 12 volt battery terminals for correct installation and torque.
• Check and ensure good ground for the negative battery cable from the Battery Monitoring Sensor
(BMS) to body, if cable eyelet is possible to move/wiggle/pivot on the stud with slight force, it must
be re-torqued.
If car does not start:
• Open the hood.
• Connect a 12 Volt starter booster
• Start the car. (Car must start to be able to continue the fault tracing, and to charge the 12 Volt battery)
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2023-01-06

Technical Journal 35542.2.0
The driver and passenger seats must be recalibrated before continuing any other steps. The seats should
be moved to the most forward position and the most backward position, this should be done two times
i.e. move the entire axis back and forth.
Which means Length axis:
- Forward
- Backward
- Forward
- Backward
The same principle for the height axis:
- Up
- Down
- Up
- Down
The seats are now calibrated.
Continue checking:
1 - Check if the Electric Parking Break (EBP) is engaged. Release it if it is.
2 - Check how many miles/km the car can drive on the electric motors in Hybrid mode (There must be
enough High Voltage charge to propel the car in HYBRID mode when so possible)
3 - Check if the motion alarm setting is activated.
4 - Do a first DTC readout with VIDA, no fault tracing at this step. Note DTC’s
5 - Check that door handles move as they should when locking/unlocking the car.
6 - Check available driving range in Pure Mode. (Pure mode must be available to continue checking)
7 - If not possible to drive in PURE, use a charge cable/power outlet if possible, if not start the engine to
charge the High Voltage battery.
Important: Make note of which charge method used, engine/power outlet.
8 - Check that driving range in Pure is about 120 - 140km /75 – 85 miles) with a fully charged high volt
battery.
9 - 1st time: Clear all DTC, no fault tracing necessary.
10 - Drive the car for 5.0Km/3.8 miles.
11 - Park and lock and allow car to go down in Abandon Mode/sleep, this will take approx. 10 min after
locking the car.
12 - Check that Center Stack Display (CSD), Driver Information Module (DIM), and interior light
actually turns off approx. 2 min after locking the car.
13 - Still in Abandon mode, check that Foot Movement Detection Module (FMDM) is working, kick
function.
14 - Read out DTC again and note down all DTC’s
15 - Compare them to approved DTC. (Only confirmed DTC must be fault traced as per VIDA) See
Attachment)
2023-01-06

Page 3 of 6

Technical Journal 35542.2.0
Read out:
• Read out the high voltage battery cell values. (If one cell deviates significantly from the others a fault
will be set for the High Voltage battery and thus charge to the 12 volt battery may be interfered)
• Connect a clamp-on meter (Amp clamp) or use the method in VIDA and measure so that Quiescent
Current (QC) consumption goes down to 12 – 14mA after 15 minutes.
• If possible check for several hours to ensure the average QC consumption remains about 13mA.
• 2nd time: Clear all DTC’s, no fault tracing is necessary.
• Update all software with VIDA by following TJ 35361
• Drive the vehicle again for 5.0Km/3.8 miles.
• Park and lock the car and let it go down in Abandon Mode. (10 min.)
• Before returning the car to the customer, read out DTC’s again. Note: If any DTC is “permanent” it
must be fault traced as per VIDA.
Warranty claim info:
*Note that the TJ number must be stated in repair order text.
To get warranty claim accepted for a job described in this TJ, please use following data:
VST OP number: 36004-2, 96166-2 (initial check) and if applicable 99932-2 (continued checking)
VST Operation Number
VST Operation Number
99932-2
96166-2
36004-2

Description
General reimbursement acc. to TJ/QB
Troubleshooting battery/installation
Software control module downloading

LABOR TIME:
Labor ops.: 99932-2; 2 hours 96166-2; 0.3 hours 36004-2; 0.5 hours
VEHICLE REPORT:
Yes, please submit a Vehicle Report Polestar if the service solution described in this TJ has no effect.
Use concern area “Vehicle Report Polestar” and sub concern area “Support needed Polestar”, use
function group 3111.

To view TJ attachments continue to next page. This TJ has two attachments.

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2023-01-06

Technical Journal 35542.2.0
Name
CEM HIGH
LOAD MODULE BCM2

BATTERY HIGH VOLTAGE REAR
INVERTER EMRR
CONTROL UNIT VCU1 FULL
CONTROL UNIT AWM

LOAD MODULE BECM

2023-01-06

DTC
U102268
U270382, U2C7F81,
U2CE183, U2D5083,
U210782, U2C7F82,
C006381, C006481,
U2C3081, U2D8482,
ED4D82
DC4087
263882, 258F82
51241C, D10900
D36B49,
D36B79,
D36B82
0DAF00

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Technical Journal 35542.2.0

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2023-01-06