Question about 2000 Chevrolet Blazer

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Perblem with shift indicator

What controls the shift up indicator

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  • Chevrolet Master
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The PCM control it, base on engine rpm,map sensor(load on engine) vehicule speed,engine temp,
PCM take action base on those input and light on
hope it helps

Posted on Mar 27, 2014

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Posted on Jan 02, 2017

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05 Trailblazer transmission says neutral but gear shiftier is locked in park.


Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The automatic transmission shift lock control switch
With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.

Circuit Description
The transmission range (TR) switch is part of the park/neutral position (PNP) and back-up lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.

These are all electronically controlled , yur best bet would be to take your vehicle to the dealer .

Apr 19, 2017 | 2005 Chevrolet TrailBlazer

1 Answer

Shifter is locked in park on a 2002 bravada that sayes on dash its in reverse


PRND321 Display
The instrument panel cluster (IPC) displays the selected gear position as determined by the engine control module (ECM). The IPC - instrument panel cluster receives a serial data message from the ECM indicating the gear position. The PRND321 display blanks if:
?€¢
The ECM detects a malfunction in the transmission range switch circuit.


?€¢
The IPC detects a loss of serial data communications with the ECM. The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
?€¢
The automatic transmission shift lock control solenoid


?€¢
The automatic transmission shift lock control switch

With the ignition in the ON position, voltage is supplied to automatic transmission shift lock control switch. Voltage flows through the normally closed contacts of the automatic transmission shift lock control switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid causing the transmission shift lever to be physically locked in the PARK position. When the brake pedal is pressed the contacts in the automatic transmission shift lock control switch open, de-energizing the automatic transmission shift lock control solenoid. This allows the shift lever to be move out of the PARK position.
The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The PCM supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
You need a Tech2 scan tool to diagnose this problem ! possible range sensor !

Sep 03, 2015 | Cars & Trucks

1 Answer

P0826 Nissan - Rogue 2009


P0826 Nissan - Manual Mode Switch Circuit
Possible causes: - Faulty Manual mode select switch (Built into control device, shifter)
- Faulty Manual mode position select switch (Built into control device, shifter)
- Faulty Control Device (Shifter)
- Control Device harness is open or shorted
- Control Device circuit poor electrical connection

When is the code detected? When an impossible pattern of switch signals is detected, a malfunction is detected.

Possible symptoms: - Engine Light ON (or Service Engine Soon Warning Light)

P0826 Nissan Description: Manual mode switch is installed in shift control device. The manual mode switch sends shift up and shift down switch signals to Transmission Control Module (TCM) with Control Area Network (CAN) communication.

TCM sends the switch signals to combination meter via CAN communication line. Then manual mode switch position is indicated on the shift position indicator.

P0826 Nissan Manual Mode Switch Circuit

May 31, 2015 | 2009 Nissan Rogue

1 Answer

1998 blazer 4x4 cannot get it into 4 wheel high when i pus the button th4x4 and low range lights both blink and it goes back to 2 wheel high


Transfer Case Shift Control Switch Indicator Flashes and Returns to Original Mode.
Circuit Description
This symptom usually occurs when a shift into or out of 4LOW will not occur. When the transfer case control module (TCCM) receives a request to shift into or out of 4LOW, the TCCM must see the following parameters before the shift routine can start:
?€¢
The vehicle speed must be below 3 MPH.


?€¢
The transmission must be in neutral.

If the TCCM does not see these conditions the shift control switch indicator lamp will flash for approximately 5 seconds and then return to the original gear.
Test Description
The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the operation of the transfer case shift control switch to help determine if the system is operating properly.

  2. This step determines if the vehicle speed sensor reading is correct.

  3. This step determines if the park switch reading is correct.

Switch Indicator Lamp Flashes and Returns to Original Mode
Step

Action

Value(s)

Yes

No

Schematic Reference: Transfer Case Control Schematics

1

Important: The transfer case shift control module is not a class 2 device, and therefore a scan tool can not be utilized on this transfer case.

Did you perform A Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check

2

  1. Start the engine.
  2. Place the transmission into NEUTRAL.
  3. Set the park brake.
  4. Depress each of the shift control switch buttons.

Does the transfer case range change with the press of all of the shift control switch buttons?
--
Go to
Testing for Intermittent Conditions and Poor Connections
Go to Step 3

3

Use the scan tool in order to read the vehicle speed sensor on the transmission control Data Lists.

Is the vehicle speed within the specified range?
0 km/h (0 mph)
Go to Step 4
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

4

  1. Put the transmission in neutral.
  2. Observe the current state of the transmission on the scan tool in the transmission control Data 2 List.

Does the scan tool indicate the transmission is in Neutral?
--
Go to Step 5
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

5

Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .

Did you complete the replacement?
--
Go to Step 6
--

6

Operate the vehicle within the conditions for causing the symptom as specified in the supporting text.

Does the symptom re-occur?
--
Go to Step 2
System OK

Feb 12, 2015 | 1998 Chevrolet Blazer

1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Feb 07, 2015 | Cars & Trucks

1 Answer

When shift indicator light blinks off transmission miss shifts


The light indicates a fault has occurred in the transmission or the electronic control sensors and actuators. You need the dealer to scan the transmission control module (TCM) to see what fault code is stored and then based on that code perform diagnostics and repair the transmission.

Apr 01, 2014 | 2011 Chevrolet Colorado

1 Answer

My 2008 Colorado cannot shift out park gear.I drove home in 4wd on Monday through snow and slush and parked. On Tuesday morning I couldn't get it out of park. I hefted on the shifter for quite a while and...


It may or may not be a problem with shifter interlock system .
Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
• The automatic transmission shift lock control solenoid
• The body control module (BCM)
• The engine control module (ECM)
• The transmission control module (TCM)
The body control module (BCM) controls the voltage supply circuit of the shift lock control solenoid. The following conditions must be met before the BCM will supply battery voltage to the shift lock control solenoid:
• The ignition is in the ON position.
• The ECM sends a serial data message to the BCM indicating the transmission is in the PARK position.
• The ECM receives a brake applied input from the brake light switch and sends a serial data message to the BCM indicating the brakes are not applied.
With the above conditions met, the BCM supplies battery voltage to the shift lock control solenoid. The solenoid is permanently grounded and therefore energizes, locking the shift lever in the PARK position. When the brake pedal is depressed the ECM send a serial data message to the BCM indicating the brakes are applied. The BCM turns off the battery voltage supply to the shift lock control solenoid. This de-energizes the shift lock control solenoid releasing the mechanical lock, allowing the driver to move the shift lever out of the PARK position. With the shift lever out of the PARK position the ECM sends a serial data message to the BCM and no voltage is applied to the shift lock control solenoid.

Apr 20, 2017 | Cars & Trucks

1 Answer

Honda element shift indicator light not working


Have a 2005 element; had the same problem. 15 amp fuze in fuze box under the hood. Fuze that controls horn, brake lights and gear shift lock out.

Sep 11, 2012 | 2007 Honda Element SC

1 Answer

Takes time shifting, and won't shift into high gear unless you gas on it.


May check fluid level and if low would more than likely indicate a leak. could also be a sensor that controls the shifting. does check engine light come on and if so,this could indicate a bad sensor.

Aug 12, 2012 | 2001 Kia Sportage

1 Answer

Transfer case grinds truck only runs in 4wheel low nothing in 4wheel high or 2wheel drive


Manual or electronic t case?

Section 07-07: Transfer Case, 4x4 System, Service 1994 Bronco/Econoline/F-Series Workshop Manual
DESCRIPTION AND OPERATION Electronic Shift Operation The transfer case is equipped with a magnetic clutch, similar to an air conditioning compressor clutch, which is located inside the transfer case adjacent to the lockup collar. The clutch is used to spin up the front drive system from zero to vehicle speed in milliseconds. This spin-up allows the shift between 2-high and 4-high to be made at vehicle speeds listed in the vehicle owner's guide. The spin up engages the front lock hubs. When the transfer case rear and front output shafts reach synchronous speed, the spring-loaded lockup collar mechanically engages the mainshaft hub to the chain drive sprocket and the magnetic clutch is then deactivated. Shifts between 4-high and 4-low can only occur with the transmission safety switches closed. The vehicle's speed must also be within specified limits as determined by the transfer case speed sensor (3 mph or under). Electronic Shift Control System
This system consists of a two-switch control system, an electronic control module, an electric shift motor (7G360) with an integral shift position sensor, and a speed sensor. Switch Control System
There are two control switches located on the upper right corner of the instrument panel for fingertip shift control. The two switches are mounted horizontally and are identified as "4x4" and "LOW RANGE". Two indicator bar lamps are located in the instrument cluster.

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When either of the two switches on the instrument panel control are depressed, the first thing that happens is that the electronic control module receives input from the transfer case shift position sensor to verify what position the transfer case is in (2H, 4H or 4L). Next, the electronic control module looks at the speed sensor and the park/neutral position switch or clutch pedal position switch (depending on transmission type). If all conditions are correct to allow the desired shift, the electronic control module will tell the electric shift motor to execute the shift. After the shift has been made and the electric shift motor is off, the control module again looks at the shift position sensor to make sure the proper shift has been accomplished. Finally, the dash indicator light and the pushbutton light on the control panel will be illuminated by a signal from the electronic control module indicating the desired function has been completed.
Electronic Control Module
The electronic control module, located on the passenger side, controls the operation of the transfer case in response to inputs to the pushbutton control by the vehicle operator, the speed sensor, shift position sensor and the park/neutral position switch. Speed Sensor
The speed sensor, mounted on the rear of the transfer case , tells the electronic control module the speed of the vehicle to allow range shifts (in or out of 4L) to occur. Shift Position Sensor
The shift position sensor, an integral part of the electric shift motor , tells the electronic control module the shift position of the transfer case . Electric Shift Motor
The electric shift motor , mounted externally at the rear of the transfer case , drives a rotary helical cam which moves the 2W-4W shift fork and 4H-4L reduction shift fork to the selected vehicle drive position.

Nov 12, 2010 | 1994 Ford F250 Supercab

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