Standard Ignition US-542 Ignition Switch

Ignition Switch for Cadillac CTS and SRX

Standard Ignition US-542 is a column-mounted ignition switch built with copper alloy conductors and tested for mechanical and electrical switching performance. It is a direct-fit service part for select Cadillac CTS and Cadillac SRX models, with the connector and terminal layout needed for proper switch operation.

Key Features

• Column-mounted ignition switch with black plastic finish
• Female rectangular connector with 1 connector interface
• 6 male pin terminals for the specified electrical connection
• Bolt-on attachment method for secure installation
• Copper alloy conductors for low-resistance electrical flow
• 100% tested for mechanical and electrical switching performance

Detailed Description

Standard Ignition US-542 is engineered for service replacement on 2003-2007 Cadillac CTS and 2004-2006 Cadillac SRX vehicles. The switch uses a bolt-on mounting design and a column location to match the original application, while the rectangular female connector and 6-pin male terminal layout support correct electrical interface. Standard Ignition US-542 is built with durable materials to maintain fit and function in daily repair use.

This part cross-references ACDelco 12450257 for the same application.

Common Repair Symptoms

• Intermittent or no crank condition when the key is turned
• Accessory power that drops out or fails to engage
• Ignition switch electrical contact wear causing inconsistent starting
• Key position response problems at the steering column
• Electrical switching faults traced to the column ignition switch

Installation Notes and Tips

Verify the connector shape, terminal count, and column mounting style before installation. Confirm the vehicle application against the listed fitment for 2003-2007 Cadillac CTS and 2004-2006 Cadillac SRX. Match the original switch orientation and inspect the harness connector for damage or corrosion during replacement.

Quality Assurance

Standard Ignition states that this ignition switch is fully tested for both mechanical and electrical performance. The use of copper alloy conductors supports reliable conductivity and consistent switching operation in service.