Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2003 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Data Link Communications Connector End Views

Data Link Connector (DLC) Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110250 16-Way F Metri-Pack 150 (BLK)
Pin	Wire Color	Circuit No.	Function
1	-	-	Not Used
2	PPL	1132	DLC Class 2 Serial Data
3	-	-	Not Used
4	BLK	1050	Ground
5	BLK/WHT	1251	Ground
6-15	-	-	Not Used
16	ORN	2140	Battery Positive Voltage

Splice Pack - SP205 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12191216 12-Way F GT 150 Splice Saver (GRY)
Pin	Wire Color	Circuit No.	Function
A	PPL	1132	DLC Class 2 Serial Data
B	DK GRN	1049	PCM Class 2 Serial Data
C	PPL	1807	Class 2 Serial Data - Primary (w/o 9C1/9C6)
D	ORN	1044	Radio Class 2 Serial Data
E	LT BLU	1122	ABS/TCS Class 2 Serial Data
F	DK BLU	1128	SDM Class 2 Serial Data
G	GRY	1036	IPC Class 2 Serial Data
H-J	-	-	Not Used
K	YEL	1127	Trip Computer Class 2 Serial Data (w/o 9C1/9C6)
L	DK BLU	2272	Amplifier Class 2 Serial Data (W/U2K)
M	LT GRN	1037	BCM Class 2 Serial Data

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready Tools Compare Repair Quote Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty

Get a Free Quote

No obligation. See pricing before you book.