u1170 lost communications with driver door switch assembly

OBD2 Code: U1170

Description: Lost Communications with Driver Door Switch Assembly

Definition: This code indicates that the vehicle’s control module has lost communication with the driver door switch assembly. This can be due to a fault in the wiring, connectors, or the switch assembly itself, leading to issues in controlling functions like window operation or mirror adjustments from the driver’s door.

: Lost communications with driver door switch assembly
Severity: Moderate

Common Causes

U1170 – Lost Communications with Driver Door Switch Assembly

Common Causes:

• Faulty driver door switch assembly
• Wiring issues such as damaged wires or poor connections
• Corrosion in the electrical connectors
• Software glitches in the vehicle’s control module

Common Misdiagnosis

Lost Communications with Driver Door Switch Assembly – Common Misdiagnosis: Faulty door switch assembly is often misdiagnosed as a wiring issue or a problem with the Body Control Module (BCM).

Common Diagnostic Steps

Lost Communications with Driver Door Switch Assembly

1. Check for any blown fuses related to the driver door switch assembly.
2. Inspect the wiring harness and connectors for damage, corrosion, or loose connections.
3. Use a scan tool to check for additional codes that may indicate a broader communication issue.
4. Test the driver door switch assembly for proper operation using a multimeter.
5. Verify that the control module is receiving power and ground signals correctly.
6. If applicable, update or reprogram the vehicle’s software to ensure compatibility with all modules.
7. If no issues are found, consider replacing the driver door switch assembly as a last resort.