AutoCodes – Saturn – B1970 Saturn

B1970 Saturn Code - Exterior Ligth Power Fault

Quick Answer

The Body Control Module (BCM) commands exterior lights on by energizing Low Beam and Parking Light Relays. Common causes include Faulty Low Beam and Parking Light Relay, Low Beam and Parking Light Relay harness is open or shorted, Low Beam and Parking Light Relay circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1970 Saturn indicates Exterior Ligth Power Fault.
Common causes: Common causes include Faulty Low Beam and Parking Light Relay, Low Beam and Parking Light Relay harness is open or shorted, Low Beam and Parking Light Relay circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 546

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 01, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1970 Saturn Description

The Body Control Module (BCM) commands exterior lights on by energizing Low Beam and Parking Light Relays. The Diagnostic Trouble Code (DTC) B1970 will set when exterior lights have been commanded on and BCM detects low voltage (short to ground) in the wire between BCM and relays. When DTC B1970 is set, BCM will command exterior lights off, and then attempt to turn exterior lights on until lights are no longer requested. DTC B1970 will clear when conditions for fault no longer exist or when scan tool is used. A history DTC will clear after 50 consecutive ignition cycles if conditions for fault no longer exist.

OBDII Code B1970 Saturn - Exterior Ligth Power Fault - AutoCodes.com — B1970 Saturn Code - Exterior Ligth Power Fault

What does this mean?

What are the Possible Causes of the DTC B1970 Saturn?

Faulty Low Beam and Parking Light Relay
Low Beam and Parking Light Relay harness is open or shorted
Low Beam and Parking Light Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1970 Saturn?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1970 Saturn code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1970 Saturn code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1970 Saturn Code

1. What are common symptoms of OBDII code B1970 in a Saturn related to exterior light power fault?

The common symptoms include non-functional exterior lights, dim or flickering lights, or warning lights on the dashboard indicating a lighting issue.

2. What are the possible causes of OBDII code B1970 indicating an exterior light power fault in a Saturn?

Possible causes include a faulty light switch, blown fuses, damaged wiring, a defective light bulb, or issues with the lighting control module.

3. How can I diagnose the OBDII code B1970 in my Saturn related to exterior light power fault?

You can diagnose the issue by visually inspecting the exterior lights, checking the fuses, testing the light bulbs, and using an OBDII scanner to retrieve the specific fault code.

4. Is it safe to continue driving my Saturn with OBDII code B1970 triggered due to an exterior light power fault?

It is not recommended to drive the vehicle with malfunctioning exterior lights as it can compromise safety, visibility, and may lead to potential accidents.

5. How can I repair OBDII code B1970 in my Saturn caused by an exterior light power fault?

To repair the issue, you may need to replace the faulty light switch, repair damaged wiring, replace blown fuses, or fix any issues with the lighting control module as necessary.

6. Can a DIY enthusiast fix OBDII code B1970 related to an exterior light power fault in a Saturn?

Depending on the specific cause, some DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides or consulting with professionals for guidance.

7. Will resetting the OBDII code B1970 related to an exterior light power fault in my Saturn solve the problem?

Resetting the code may temporarily clear the warning light, but it is crucial to diagnose and address the root cause of the issue to prevent it from recurring.

8. How much does it typically cost to repair OBDII code B1970 indicating an exterior light power fault in a Saturn?

The cost of repairs can vary significantly based on the specific cause of the issue. Simple fixes like replacing a light bulb may be inexpensive, while more complex problems could require professional intervention and higher costs.

9. Are there any preventive maintenance tips to avoid triggering OBDII code B1970 related to an exterior light power fault in my Saturn?

Regularly inspecting the exterior lights, maintaining a clean and secure electrical system, and promptly addressing any lighting issues can help prevent the occurrence of this fault code.

10. Can a faulty exterior light power system in a Saturn triggering OBDII code B1970 affect other vehicle systems?

Yes, a malfunctioning exterior light power system can impact overall vehicle safety, electrical system performance, and may trigger additional warning lights or codes related to lighting issues.