TDA4VM: GPIO1_4 control in mcu1_0

Dear TI.

In MCU1_0, I can read gpio of GPIO0 group as below:

*(volatile unsigned int *)(0x00011C024) = 0x50007;       //AJ20 GPIO0_9

*(volatile unsigned int *)(0x00011C04C) = 0x50007;       //AJ21 GPIO0_18

GPIOSetDirMode_v0(CSL_GPIO0_BASE,9,GPIO_PIN_DIR_INPUT);

GPIOSetDirMode_v0(CSL_GPIO0_BASE,18,GPIO_PIN_DIR_INPUT);

tmp = GPIOPinRead_v0(CSL_GPIO0_BASE,9);

tmp = GPIOPinRead_v0(CSL_GPIO0_BASE,18);

But when I config and set GPIO1_4 of GPIO1 group :

*(volatile unsigned int *)(0x00011C214) = 0x10007;       //V4   GPIO1_4 

GPIOSetDirMode_v0(CSL_GPIO1_BASE,4,GPIO_PIN_DIR_OUTPUT);

GPIOPinWrite_v0(CSL_GPIO1_BASE,4,GPIO_PIN_VAL_LOW);   //or  write  GPIO_PIN_VAL_HIGH   (1)

And measure the voltage of V4. The voltage has not changed.

Please help check, and how to control GPIO1 group(GPIO1_4). 

Thanks