So I've been battling with a funky gauge cluster for a bit. In the past, cleaning the pins and bending them slightly to make a better contact worked. Now, they barely function. Before going around replacing parts I want to find out where the problem is coming from. I've been getting very personal with the all the wiring and here's where I'm at.
Suspicions:
- losing voltage from airbag control module to gauge cluster
- bad gauge cluster
- PCM not sending enough voltage
Known:
- resistance between cluster and ACM 0.5 Ohm measured at both CCD bus wires
- resistance between CCD bus (+) and (-) 120-121 Ohm
- resistance between ACM ground and chassis 0 Ohm
- resistance between cluster ground and chassis 0 Ohm
- voltage between cluster ground and chassis 0V
- voltage between ACM ground and chassis 0V
- voltage at CCD bus (+) and (-) each get 1-1.5V constantly changing which should be 2.5V
Questions:
- Do I have too much resistance in the wires from the cluster to the ACM, 0.5 Ohm, that could be causing the voltage drop?
- How would I measure the voltage being sent from the PCM to the cluster without unplugging the PCM with the battery in? Is it safe to do so?
- I know I'm losing voltage and I'm pretty sure my grounds are good. So where else should I check for that loss?
Suspicions:
- losing voltage from airbag control module to gauge cluster
- bad gauge cluster
- PCM not sending enough voltage
Known:
- resistance between cluster and ACM 0.5 Ohm measured at both CCD bus wires
- resistance between CCD bus (+) and (-) 120-121 Ohm
- resistance between ACM ground and chassis 0 Ohm
- resistance between cluster ground and chassis 0 Ohm
- voltage between cluster ground and chassis 0V
- voltage between ACM ground and chassis 0V
- voltage at CCD bus (+) and (-) each get 1-1.5V constantly changing which should be 2.5V
Questions:
- Do I have too much resistance in the wires from the cluster to the ACM, 0.5 Ohm, that could be causing the voltage drop?
- How would I measure the voltage being sent from the PCM to the cluster without unplugging the PCM with the battery in? Is it safe to do so?
- I know I'm losing voltage and I'm pretty sure my grounds are good. So where else should I check for that loss?