With CTM Module
NOTE:^ CTM Diagnostics are not accessible with NGS Tester.
^ The diagnostic test mode is used to test the Central Timer Module (CTM) while the CTM is in the vehicle. While in this mode, Diagnostic Trouble Codes (DTCs) can be retrieved and cleared and CTM inputs can be individually tested.
^ Normal CTM functions are disabled while in the diagnostic test mode.
1. Entering and Exiting Diagnostic Test Mode
The diagnostic test mode is entered by shorting together the pins of the diagnostic connector, located behind the right side kick panel.
The CTM returns to the normal mode when the pins of the diagnostic connector are no longer connected.
2. Operation
The diagnostic test mode is made up of the following:
^ Tone and Door Ajar Indicator Test mode.
^ DTC Output mode.
^ Input Test mode.
The Tone and Door Ajar Indicator Test mode is run immediately upon entry into the diagnostic test mode. When this is complete, the key-in-ignition input is then used to switch between the Input Test mode and the DTC Output mode. When the key is not in the ignition switch, the DTC Output mode will be active. When the key is in the ignition switch, the Input Test will be active. The Input Test mode and DTC Output mode can be switched between indefinitely until the pins of the diagnostic connector are disconnected.
After the 3 second test, the CTM will pause for 1 second and then proceed to either the Input Test mode or DTC Output mode depending on the state of the key-in-ignition input.
DTC Output Mode
When the CTM is in the normal mode of operation, it is continually monitoring itself. When a concern occurs that the CTM can recognize, it is recorded.
The DTC Output mode outputs DTCs by sounding the chime. This mode is entered from the input test mode when the key is removed from the ignition switch. These DTCs may then be used to help diagnose hard faults and/or intermittent failures. Such failures will often be observed by the vehicle owner while the vehicle is on the road but may not occur when the vehicle is being repaired.
Tone and Door Ajar Indicator Test Mode
Tone and Door Ajar Indicator Test Mode Table:
When the diagnostic test mode is first entered, the CTM will generate a tone and illuminate the door ajar indicator for three seconds if the ignition is in the RUN/ACC or RUN position. Use the Tone and Door Ajar Indicator Test Mode Table to diagnose concerns with the warning chime and door ajar indicator.
Erasing DTCs
DTCs are erased when the diagnostic mode is exited if the ignition switch has been moved to the START position any time during the diagnostic test mode. DTCs are also erased when power is removed from the CTM.
CTM DTCs
Example Of DTC 21 Output:
The CTM Diagnostic Trouble Codes (DTCs) are two digits in length and are output to the operator by the sounding of the chime. The first digit is output, followed by a one second pause, followed by the next digit. Each digit is made up of one to nine one-second individual chime tones. The Example Of DTC 21 Output represents the output of the DTC 21.
DTC Chart
The entire set of stored DTCs will be repeated indefinitely until either the Input Test mode is entered or the ground is removed from the diagnostic input. Refer to CTM Diagnostic Trouble Code (DTC) chart for all possible interior lighting (CTM controlled) DTCs. Diagnostic Trouble Code Tests and Associated Procedures
Input Test Mode
The Input Test mode individually tests the CTM inputs. It is entered from the DTC Output mode when the operator puts the key in the ignition assembly. Inputs may be tested in any order. As an input is toggled on or off, the door ajar indicator (if the ignition switch is in the RUN position) and tone outputs will be activated for one second for confirmation. At any time, if the key is removed from the ignition switch, the DTC Output mode will be re-entered.
CTM Input Test Chart:
Note that all CTM functions remain disabled while in the diagnostic test mode. The CTM Input Test Chart shows all the possible inputs that can be tested for the CTM Controlled Interior Lighting System.
NOTE: Several of the inputs will not operate unless the ignition is in the RUN position.
1. The wiper/washer system is a Generic Electronic Module (GEM)/Central Timer Module (CTM) controlled system.
2. Verify the customer concern by operating the wiper/washer system.
3. Visually inspect for the following obvious signs of mechanical and electrical damage.
VISUAL INSPECTION CHART
Mechanical
^ Hoses to windshield washer pump
^ Wiper/washer switch
^ Wiper linkage
^ Windshield wiper motor
Electrical
^ Fuse(s)
^ Damaged wiring harness
^ Loose or corroded connector(s)
^ Circuitry open/shorted
^ Bulb(s)
4. If the concern is not visually evident, determine the symptom and proceed to Symptom Chart. Symptom Related Diagnostic Procedures