---
title: "Cisco 79XX - Expansion Module Red Lights"
slug: "cisco-79xx-expansion-module-red-lights"
tags: ["calltower", "public"]
updated: 2026-09-18T13:47:54Z
published: 2026-09-18T13:47:54Z
canonical: "learn.calltower.com/cisco-79xx-expansion-module-red-lights"
---

> ## Documentation Index
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# Cisco 79XX - Expansion Module Red Lights

## Goal

The purpose of this document is to troubleshoot the 7970's expansion module with all lights are red.

### Problem

Expansion module all light up red.

- CCM: CHI CM 6.
- Phone Model: 7970
- Expansion module: 7914

The phone had an old firmware(TERM70.6-0-2-0S)

It couldn't upgrade directly to the CHI CM 6 default load for 7970's(SCCP70.8-5-3S).

The old firmware doesn't work with the side car.

### Solution

1. Upgrade the phone to version : SCCP70.8-3-1S.
2. Then upgrade to Version: SCCP70.8-4-4S.
3. Then remove the load specified in CCM so it would upgrade to the default version: SCCP70.8-5-3S