Need to find out where pin #25 is on an early 99 suburban 5.7.

[Dave J]

Need to find out which harness pin #25 is on an early 99 suburban 5.7. Tan white stripe. low voltage return for bank 1 sensor 1 o2

 

[scott2093]

Would it be on the vcm or do you mean where on the vcm?

 

[Schurkey]

Download the service manual set for your vehicle. The answer is in there.

 

[xXxPARAGONxXx]

Need to find out which harness pin #25 is on an early 99 suburban 5.7. Tan white stripe. low voltage return for bank 1 sensor 1 o2

The harness that goes to VCM connector C1 (blue 32-pin connector).

Pin 25 is a tan/white wire, circuit 1653, HO2S Bank 1 Sensor 1 Low.