Radio works just fine but with ignition and radio turned off radio ckt is drawing in excess of 300ma (my meter only reads to 300ma) and is running battery down overnight. The problem is downstream from the 15 amp fuse under the back seat. what should I look at next?
Look to see what else is powered by that fuse and power source its some thing in that system and its not the radio. disconect one item at a time and see if it still kills the battery keep doing that till the battery does not die any more and there you find your issue. and be able to fix it this will take some time but you will save lots of $$$$$$ in the end
SOURCE: I changed the battery in my 2002 Chevy Trailblazer
Replaced the 125A Mega Fuse ($10 from dealer). The fuse is outside the fuse box under the hood, under the connectors from the battery to the fuse box.
SOURCE: I have a 2001 chevy blazer that has a short that
BATTERY VOLTAGE CAN DRAIN THROUGH STARTER RELAY OR BAD DIODE IN THE ALTERNATOR.I WOULD REPLACE THE STARTER RELAY.I AM LOOKING AT A ELECTRICAL DIAGRAM.YOU HAVE A 40 AMP IGNITION FUSE THAT FEED THE STARTER RELAY.IF STARTER RELAY HAS A SHORT IN IT.IT COULD DRAIN THE BATTERY.
SOURCE: I have a 2002 chevy trailblazer LS. The gauges on
check to make sure a fuse hasnt blown or a relay
SOURCE: Rear tailight (brake/running light) drivers side
You will need to check the contacts where the bulb inserts for arcing, causing a short. Test for power and ground at the conn. 2 b sure you have power there. If this is the case you will need to replace the light assembly.
SOURCE: The heated seats stopped working.
check your power relays to the seats i bet one or both is out or you lost voltage to them
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Ignition voltage is present on circuit 839.
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The CKP signal at PCM is NOT detected.
DTC P1599 is a type D DTC
The PCM has the ability to set a diagnostic trouble code (DTC) if the engine stalls when the ignition has NOT been turned OFF. This DTC may aid in intermittent diagnosis of a customer complaint of intermittent engine stall. The scan tool Failure Record information can be duplicated under the same stall conditions in an attempt to reproduce the occurrence. Since DTC P1599 is a type D DTC, the PCM will not command the MIL or SERVICE telltale ON. This DTC can set due to driver error. For example, a vehicle equipped with a manual transaxle in which the clutch was released too quickly causing the engine to stall.
DTC P1640 (PCM Output Circuit)
The PCM contains an output driver module (ODM) which controls 7 circuits: A/C relay, air pump relay, EVAP purge solenoid, EVAP vent solenoid, fan control 1, fan control 2, and TCC solenoid. The ODM controls each of these circuits independently by controlling the circuit ground. The ODM monitors the voltage level at each of the 6 circuits into the PCM when the device is being commanded ON or OFF. When the device is commanded OFF, the circuit is not grounded, the voltage level at the PCM should be high (ignition voltage). When the device is commanded ON, the circuit is grounded, the voltage level at the PCM should be low. Each of the 7 drivers in the ODM contains a feedback circuit used to determine if a particular circuit failed, which can be read on the scan tool. DTC P1640 sets when any one of the 7 feedback voltages is low when that device is turned OFF or when any one of the 7 feedback voltages is high when that device is turned ON when the engine is running.
Sounds to me like you have a short on one of these circuits !
To locate an intermittent problem, use the scan tool to command each of the 7 solenoids tied to the ODM circuit ON and OFF independently while monitoring:
A/C RELAY CKT OPEN SHORT TO GND
A/C RELAY CKT SHORT TO VOLTS
OR
AIR PUMP REL. CKT OPEN SHORT TO GND
AIR PUMP REL. CKT SHORT TO VOLTS
OR
EVAP PURGE CKT OPEN SHORT TO GND
EVAP PURGE CKT SHORT TO VOLTS
OR
EVAP VENT CKT OPEN SHORT TO GND
EVAP VENT CKT SHORT TO VOLTS
OR
FC 1 RELAY CKT OPEN SHORT TO GND
FC 1 RELAY CKT SHORT TO VOLTS
OR
FC 2 RELAY CKT OPEN SHORT TO GND
FC 2 RELAY CKT SHORT TO VOLTS
OR
TCC DUTY CYCLE OPEN SHORT TO GND
TCC DUTY CYCLE SHORT TO VOLTS
If IGN 3 fuse is open, A/C RELAY CKT OPEN SHORT TO GND, EVAP VENT CKT OPEN SHORT TO GND, and EVAP PURGE CKT OPEN SHORT TO GND parameters on the scan tool will read YES.
Do you have a DVOM - digital volt ohm meter ? You need to check each wire in the above circuits for a short to ground or B+ !
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